Manchester United defender Lisandro Martinez has responded to Jamie Carragher's criticism that he was too small to cut it in the Premier League.

The ex-Liverpool defender doubted the Argentine's credentials after a 4-0 hammering at Brentford. However, he has since answered those critics.

He told the Manchester Evening News: “To be honest, I put my full focus here, in the training.

"I can't control that, you know. It's just an opinion.

"I understand when people say that – they show me who they are, you know? It's not my problem. I'm here, I'm really happy, the people are happy with me as well, I'm really happy to be in this team as well and my teammates are the same, you know? That's the most important thing.

"My goal is to get trophies here, I always train hard and, like I said, in an interview before, I don't have to show anything, I just have to show it here, with my people.

“For example, in the beginning, in Argentina, it was the same. But it's normal because, in football, it's not normal to play as a centre-back with my height. It's not easy as well, you know.

"I try to do my best, to be honest, but you have to work very hard. You have to be very clever on the pitch because you have to be sharp in every situation. Because if you're smart you can win the duels.

"It was tough (at the start), for sure, because it was not the start that we wanted. For sure, it was hard, the result, the way that we lose, the attitude was really bad.

"The team we changed directly the mentality, it was like, okay, we are in the ground but now we have to prove, to fight again. Sometimes it is good to see the bad things and then you have to change on the pitch."