Arsenal great Martin Keown has labelled forward Alexis Sanchez as a tricky player to manage.

The Chilean, who is famous for his eagerness to constantly be on the pitch, was visibly upset when Arsene Wenger substituted him six minutes from the end of the 1-0 win over Norwich City last week.

Former Gunners skipper Keown feels that despite his willingness to always compete, Sanchez could sometimes be a handful to keep an eye on.

"I get the feeling that Sanchez can be a player who is hard to handle," Keown told the Daily Mail in a Q&A.

"The last time I visited the training ground he was on a day off and he had actually come in to train.

"He is always so desperate to play and that can be quite tricky to manage.

"But I wouldn't take too much notice of that reaction – sometimes you don't want your players to be happy about coming off.

"When I played we all wanted to play every minute and that's the case with Sanchez.

"As long as you don't go over the top I think it's ok to show your disappointment."