Paul Merson has slammed Arsene Wenger’s ‘embarrassing’ decision to drop Alexis Sanchez for Arsenal’s crucial Premier League clash against Liverpool.Fans were baffled when Sanchez – who has scored 20 goals this season – was named on the bench for Saturday’s clash, with Olivier Giroud and Danny Welbeck preferred up front.The Chilean eventually came on at half-time – with the Reds 2-0 up – and while he provided an assist for Welbeck to pull a goal back, it was not enough as Liverpool ran out 3-1 winners.Wenger insisted it was a tactical decision to leave Sanchez out, although later claims suggested the star was actually dropped after a bust-up with the boss and a number of team-mates.Monday’s reports also continued to link him with an Emirates Stadium exit, with French champions Paris Saint-Germain strongly linked with a summer move.And former Arsenal midfielder Merson, who was stunned by Wenger’s decision, admits it could be the final straw in Sanchez’s patience with the club.“If Ozil was fit that day, you could understand why he would be put on the bench. He doesn’t work hard enough sometimes, so I could probably understand that away at Liverpool,” he said.“But not Sanchez! Whatever way you weigh it up, it’s wrong. It’s absolutely wrong.“He gives you everything, he’s their biggest player by a million miles, this is the biggest game they’ve had because they’ve got to get in the top four and Wenger puts him on the bench.“I’m not surprised he wants to leave. It’s embarrassing.”Arsenal fans are apparently getting ready to stage a big anti-Wenger protest ahead of their Champions League game against Bayern Munich on Tuesday.Sports Breakfast host Alan Brazil suggested the proportion of supporters who want the French boss to leave the club could now be as many as 60/40, but Merson believes the odds are far greater after this latest Sanchez controversy.“I think Wenger would settle for 60/40 – it’s got to be more after that,” he added.“This is Sanchez – everybody in the world of football knows that he has to play for Arsenal. You put him down on the team sheet and then you start putting all the others down after that.“And in a big match! I could understand if they were playing at home to Burnley and then had a chance of beating Bayern Munich on Tuesday – then you could understand him being on the bench for that reason.“I always say when managers are under pressure they make bad decisions, and this was one of them.”Listen to talkSPORT’s interview with Paul Merson IN FULL above!