Paul Merson has claimed that Manchester United striker Zlatan Ibrahimovic is no longer "world class" following a dip in form.

The former Sweden international started the season well with four goals in his first four Premier League games, but he has not scored since September 29.

Former Arsenal player Merson believes that Ibrahimovic will get chances to end his drought against Burnley this weekend, but does not regard him as one of the world's best forwards.

"Zlatan Ibrahimovic was a world-class striker but he's not anymore," Merson told Sky Sports News. "He is 35 and playing in the hardest league in the world so as the season goes on, I can't see him getting better.

"Jose Mourinho will obviously stick with him despite his recent struggles and he should get a few opportunities against Burnley, who haven't looked up to scratch away from Turf Moor."

Ibrahimovic joined United on a free transfer from Paris Saint-Germain in the summer.