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“But now it feels like they’ve got a manager who knows what he’s doing.

“Also, it feels like there’s a spirit at United that we haven’t seen for a while.

“It feels like that’s coming back. I think there’s something happening at Manchester United that I didn’t see with those other managers. So it’s worry, yeah!”

Carra, 45, also ate humble pie regarding his previous criticism of Lisandro Martinez.

Last August he claimed he was “convinced” that the £55million signing wouldn’t work – due to concerns regarding the Argentine’s 5ft 9in height.

But now labelling Martinez as his “biggest surprise” of the season – Carragher said: “He’s been a big part of Manchester United’s spirit.

“There was a game I saw a few weeks ago and he was a sub, and someone scored a late goal, and he was right involved in the celebrations.

“At the World Cup with Argentina, we saw him have that fight – with him and Casemiro coming in, they feel more powerful and strong.

“Someone of that size will get exposed in the air – that has to happen at some stage.

“Every player has weaknesses; the best players hide them or make sure they don’t get exposed.

He’s a really good player and he’s surprised me the way he’s coped.”

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