Manchester United Champions League winner Rio Ferdinand admits he's a fan of Lisandro Martinez.

The Argentina defender is to sign for United from Ajax today.

"The more I've looked into him and the vibes and the stories I'm hearing and the mutterings from different people – it gets better," Ferdinand said on Vibe with Five.

"I listened to an interview with Jurrien Timber, the young player that United were looking to sign, the centre back Martinez played alongside at Ajax.

"He was saying, 'When I'm not on my game and a bit out of concentration, Martinez always shouts at me, he always swears at me in in his language and gets me going'."

"I've been shouting about the character element for a long time and from what I'm hearing from various people, Timber being one of them, is that he has the character.

"He's a leader. He [makes] demands of other people and he's somebody who wants to get physical and very aggressive but who can also play."

Ferdinand has admitted to be concerned over his 5'9' frame, which means that Martinez is much smaller than the majority of centre backs in the Premier League.

"If you're going to ask is there any question marks about him, I think it would be his height and his pace would be the only two," Ferdinand added.