Arsenal manager Arsene Wenger has revealed the reason behind forward Theo Walcott's absence from the Champions League squad for the clash with PSG.

The French manager confirmed that he decided to leave the 27-year-old back at home due to a mild knee injury.

"He has a knee problem," Arsenal boss Wenger said ahead of the game.

"I think it's very short term but he's not completely fit so I left him at home.

"Basically its 90 percent of the squad who played on Saturday who play tonight."

Arsenal held the French giants to a 1-1 draw in Paris after Alexis Sanchez scored in the 78th minute to cancel out Edinson Cavan's first-minute opener.