Now departed Manchester United defender gave his opinion on his old teammate.
Manchester United's one big signing last summer Marouane Fellaini endured a season to forget at the club, and will have to prove to Louis van Gaal that he deserves to be part of his squad.
The Belgian failed to impress, or score a single goal for the Red Devils, with his poor displays even more perplexing due to the fact his old Everton manager David Moyes was in charge of United.
Utilised mainly as a defensive midfielder, Fellaini was not effective in shielding the back four, and centre-back Rio Ferdinand firmly believes it is not his best position.
As a pundit on the BBC for Belgium's World Cup game with USA, Ferdinand was quizzed by host Gary Lineker as to what exactly Fellaini's best position is.
Ferdinand said: "I think his best position is off the frontman. At Everton we played against him numerous times, I see him play against Chelsea, Man City, his best games in an Everton shirt were off the front man.
"He's difficult to play against he gets that ball into him, he's awkward, he puts his arms everywhere, and that's where he's most effective for me. You can play him in midfield but I think you get the best out of him..."
Lineker at this point interjected: "Hence why he didn't fit in at Manchester United becaue he never got the chance to play there."
Ferdinand responded: "Well I think you play players in their best positions and I think his best games for Everton were up there, causing problems for centre halves."
The comments from the recently released star are a slight dig at sacked manager David Moyes for failing to play the Belgian in his 'best position', one in which he was effective for the Toffees, something Ferdinand can attest to having come up against him.
The problem Moyes faced was it is not quite so simple in terms of team selection at United, with Wayne Rooney, Juan Mata and Shinji Kagawa all jostling to play in the attacking midfield spot - but Ferdinand's point remains that if you are not picking a player in their best position, you cannot expect the optimum results.
More of a problem for Fellaini, was that he and Michael Carrick were never an effective partnership. If United had a solid enforcer, of the type of Nigel de Jong or Luiz Gustavo, or even William Carvalho, the Belgian would be given more license to get forward from a deeper midfield position, without having to play as a number 10.
It's a challenge master tactician Louis van Gaal has to unlock, but if he deems it not worth the hassle or beyond even him to turn Fellaini into an asset for United, don't expect him to ask the Belgian to stick around for long.