Former Arsenal striker Ian Wright has said on BT Sport that he was surprised Aaron Ramsey was used off the bench against Hull City on Tuesday night.
After the Gunners lost Per Mertesacker and Gabriel Paulista to injury and with a lack of defenders available to replace them, Ramsey was summoned to play a part during the second half of the FA Cup replay at the KC Stadium.
Wenger also admitted that he was concerned with the injury sustained by one of his key men, and Wright has questioned why he was risked at a period in the game when Arsenal were 1-0 ahead against their Championship opponents.
Wright said: "I was surprised to see Aaron Ramsey come on. If you are going to rest him, then rest him and bring one of the youngsters on.
"When you come on at that stage of the game, you are not warmed up properly because it was such a quick substitution. He is injured now and he is an integral part of the run-in."
Upon Gabriel's withdrawal, Ramsey did not enter the action straight away, instead taking an extra two minutes to prepare for his introduction.
As far as Wenger's options were concerned, he could have also introduced Mesut Ozil, Alexis Sanchez, Jeff Reine-Adelaide or Chris Willock.
Of his three senior choices, Ramsey was the most logical with Ozil and Sanchez both playing a lot of football in recent weeks, while Reine-Adelaide was introduced when Ramsey suffered his injury.
Willock - an 18-year-old midfielder - is yet to make his debut in the first team.