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The Gunners boss made eight changes from the starting XI from last week's Champions League semi-final first leg at Old Trafford, with the likes of captain Cesc Fabregas, Togo striker Emmanuel Adebayor and regular goalkeeper Manuel Almunia all rested.
However, Arsenal, skippered by Andrey Arshavin who cannot play in Tuesday night's European tie, again showed their potential as a brace from Nicklas Bendtner - his first after a blunder from England keeper David James - and a clinical second-half strike by Mexican Carlos Vela sealed a comfortable 3-0 victory.
Pompey - who finished with 10 men following Noe Pamarot's red card for a professional foul late on - should have enough points on the board to be safe from the drop.
The Gunners head into their all-or-nothing clash with Manchester United secure in the knowledge of another top-four finish following a 21-match unbeaten league run.
Wenger confirmed his team selection was nothing to do with any fresh injuries.
"I wanted to give a breather to some of the players," he said.
"We dominated the first half and created plenty of chances through our movement and technical quality.
"We were sharp, composed and mobile with a great attitude.
"They changed their game plan at the start of the second half and we struggled a bit. They had the turning point with a potential 2-1, but after we scored the third goal, the game was over."
Wenger added: "I have no doubts about the younger players because I see them every day and what we work on, you could see that on the pitch today.
"Some of those who played could play again on Tuesday."
Bendtner did his chances no harm at all with a strong performance, capped by a double strike, the second from the penalty spot on 41 minutes.
"If I have one merit, I always believed in Bendtner," said Wenger.
"He is developing very well and showed that again today."
Pompey were less than impressed by the decision to award a penalty when Arshavin went down under a challenge from Sean Davis, former Gunners defender Sol Campbell booked for his protests.
Wenger, though, maintained the decision by referee Lee Mason was correct.
"Some people said Andrey said it was not a penalty, but I do not know," he said.
"From outside, it looked a penalty, but before there was 100% a penalty on Vela."
Wenger revealed the decision to hand Arshavin the captaincy was reward for the way the Russian has settled into the squad following his January deadline-day move from Zenit St Petersburg.
"I like rotational leadership and he was the most experienced player in a young side," said the Arsenal manager.
"Since he has arrived here, he has a fantastic attitude with everybody and I wanted to reward that."
Pompey boss Paul Hart felt the penalty decision had a big influence on way the game went on to develop.
"My players were saying it was not a penalty and, having seen it again, I agree with them," he said.
"It certainly made life more difficult for us.
"We had a great chance before Arsenal scored, and another at 1-0.
"We came out fighting in the second half, created gilt-edged chances and were making a fist of it before the third goal.
"We were in there punching and if we had taken those chances, we would have made it interesting."
Pompey remain seven points clear of relegation, with three games left.
Hart, in charge until the end of the season, said: "The teams around us lost, so today it has not made that much difference to us.
"I know other teams have some difficult fixtures, so if we can get one more win, life will be easier for us."
However, Arsenal, skippered by Andrey Arshavin who cannot play in Tuesday night's European tie, again showed their potential as a brace from Nicklas Bendtner - his first after a blunder from England keeper David James - and a clinical second-half strike by Mexican Carlos Vela sealed a comfortable 3-0 victory.
Pompey - who finished with 10 men following Noe Pamarot's red card for a professional foul late on - should have enough points on the board to be safe from the drop.
The Gunners head into their all-or-nothing clash with Manchester United secure in the knowledge of another top-four finish following a 21-match unbeaten league run.
Wenger confirmed his team selection was nothing to do with any fresh injuries.
"I wanted to give a breather to some of the players," he said.
"We dominated the first half and created plenty of chances through our movement and technical quality.
"We were sharp, composed and mobile with a great attitude.
"They changed their game plan at the start of the second half and we struggled a bit. They had the turning point with a potential 2-1, but after we scored the third goal, the game was over."
Wenger added: "I have no doubts about the younger players because I see them every day and what we work on, you could see that on the pitch today.
"Some of those who played could play again on Tuesday."
Bendtner did his chances no harm at all with a strong performance, capped by a double strike, the second from the penalty spot on 41 minutes.
"If I have one merit, I always believed in Bendtner," said Wenger.
"He is developing very well and showed that again today."
Pompey were less than impressed by the decision to award a penalty when Arshavin went down under a challenge from Sean Davis, former Gunners defender Sol Campbell booked for his protests.
Wenger, though, maintained the decision by referee Lee Mason was correct.
"Some people said Andrey said it was not a penalty, but I do not know," he said.
"From outside, it looked a penalty, but before there was 100% a penalty on Vela."
Wenger revealed the decision to hand Arshavin the captaincy was reward for the way the Russian has settled into the squad following his January deadline-day move from Zenit St Petersburg.
"I like rotational leadership and he was the most experienced player in a young side," said the Arsenal manager.
"Since he has arrived here, he has a fantastic attitude with everybody and I wanted to reward that."
Pompey boss Paul Hart felt the penalty decision had a big influence on way the game went on to develop.
"My players were saying it was not a penalty and, having seen it again, I agree with them," he said.
"It certainly made life more difficult for us.
"We had a great chance before Arsenal scored, and another at 1-0.
"We came out fighting in the second half, created gilt-edged chances and were making a fist of it before the third goal.
"We were in there punching and if we had taken those chances, we would have made it interesting."
Pompey remain seven points clear of relegation, with three games left.
Hart, in charge until the end of the season, said: "The teams around us lost, so today it has not made that much difference to us.
"I know other teams have some difficult fixtures, so if we can get one more win, life will be easier for us."