Ayew was picked to play down the left-hand side against Tottenham Hotspur yesterday, but he did not have much of an influence on the match.
Villa were beaten 2-0 by Spurs on Sunday and the 24-year-old only had a couple of moments where he showed his true quality.
Barton does not believe that Ayew is to blame for the level of his performances though, as he feels his former teammate has been played out of position by Garde.
“Their team against Spurs had two strikers in it but one of them, Jordan Ayew, was on the left of midfield,” Barton said.
“I played with Ayew at Marseille and he is a central striker, either on his own or with a partner, but he was being asked to be a left midfielder and get up and down that flank.”
Garde opted to start with Rudy Gestede up front instead of Ayew for Villa’s match yesterday.
Ayew has generally been handed a role as a winger this season, but he has still been one of Villa’s better players.
The Ghanian international has looked Villa’s brightest attacking threat and he has managed to score five times in 28 appearances.
Villa could struggle to keep hold of Ayew over the summer, however, if their relegation is confirmed.
Ayew is one of Villa’s top earners, and the Telegraph claim that West Ham United are interested in signing him.