Liverpool legend Graeme Souness has dismissed the impressive form of Manchester United defender Lisandro Martinez.

Martinez arrived at Old Trafford from Ajax this summer in a deal worth up to £57million and has been praised by United fans for the positive impact he's had on their defence.

However, Souness is not quite as convinced as others and instead insisted that the Argentine will eventually be 'caught' out due to his lack of height.

Speaking on TalkSport, Souness said: "They've [Man United] got better players in. Whoever's responsible for that, they deserve a pat on the back."

When asked specifically on Martinez, he claimed: "That worry for me is still there. If you watch at set-pieces, he still uses a blocker or they use him on the near post. He's not got the physique to take on the big guys and man-mark them.

"I think he's brought a bit of aggression to them. He definitely has. My experience in the dressing rooms are, if you've got a couple people that are willing to stand up and fight, you've got several people coming in behind you."

He continued: "There's a lot to like about him. I like his aggression. The first thing he did, when he played Liverpool, he's gone right through Mo Salah early on. For the rest of the game, Salah was looking for him. I like that.

"I just feel, when you're that size, you'll get caught. You'll get pinned in the box. I don't think he's terribly quick. I don't think he's terribly good on the ball. But he's got something about him that makes other people play [well].

"5ft 9in and he's playing against guys that are 6ft 2in. I can't tell you a centre-back, in my time in the English game, that's been super successful being that size."