The Burnley midfielder criticised Alex Sanchez's performance against Barcelona and said it shows that the Chilean is not in the top class of players.
Joey Barton has had some harsh words for Arsenal forward Alexis Sanchez on talkSPORT, telling the radio station that the Chilean's inability to make a mark on the game against Barcelona shows that he is not a match-winner.
Sanchez was one of several Gunners attackers who struggled to have a decisive impact at the Emirates as a frustrated Arsenal eventually succumbed to a 2-0 defeat which all but knocks them out of the Champions League.
The 27-year-old forward was expected by many pundits to play as if he had a point to prove against his former club, but instead failed to find any real foothold in the match.
Barton said that he had concerns about Sanchez's consistency when he first arrived at the Emirates for around £35 million in 2014, and was adamant that the Chilean's underwhelming display on Tuesday night showed that he is just not in the top bracket of world footballers.
The former Manchester City and Newcastle man told talkSPORT: "Alexis Sanchez, when he signed for Arsenal I said a bit about him being slightly inconsistent. Whilst everyone was getting carried away with him, I didn’t think he would be the piece in the jigsaw that took Arsenal on to be league champions – ironically this season they have a good chance of doing that.
"We saw that last night [Tuesday], that was a prime opportunity on the elite-level stage [to] go and be a match-winner, show everybody that you are an elite-level match-winner, and I think he failed to do that.
"On the other side of the coin, Messi is a proven elite-level match-winner and he didn’t have his most flamboyant, his most exciting game but he did what the best in the world do."
Sanchez has been a key player for Arsenal since his arrival in England nearly two years ago, scoring 25 goals in 52 matches in his first season at the club.
The current campaign has been hindered by injury, with the forward only returning last month from an injury picked up in November, and he has just one FA Cup goal to his name so far in 2016.