Emmanuel Adebayor has joined Crystal Palace on loan until the end of the season.
The former Arsenal midfielder believes that if Alan Pardew can get the best out of the 31-year-old then he will have made an outstanding addition.
However, Merson doubts whether Adebayor will show any consistency at Selhurst Park, and he warned Palace that the veteran forward could show patchy form.
"If Adebayor plays it could be an outstanding signing,” Merson said. “He is big, strong, quick and unplayable when he gets going.
"The problem is that for four weeks he will be like that but then the next four he will be like me at 47. That will be him all over.”
Adebayor is a player well known to Premier League observers, having spent much of his career in England.
The former Real Madrid man’s quality is undoubted, but inconsistency has been a feature of his career.
Adebayor has often played brilliantly for a series of matches, and then lost form entirely, plus there are always doubts about his temperament.
The experienced striker has joined Palace on a six-month contract, as Pardew looks to increase his forward options.
Adebayor could make his debut for the Eagles against Stoke City in the FA Cup tomorrow.