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Jurgen Klopp has revealed how Liverpool have been roughing up Alisson Becker to prepare him for his real introduction into life in the Premier League.

The £65million keeper enjoyed a quiet debut against West Ham but promises to be busier in Monday night's showdown with Crystal Palace.

Goalkeeping coach John Achterberg has been challenging the Brazil No 1 for high balls while holding a rugby tackle bag in training and Liverpool have been busy practising defending set-pieces in a crowded penalty box in anticipation of what awaits them at Selhurst Park.

“It is not really rugby, it is goalkeeper training,” Klopp said.

“All the boys did it. When Loris (Karius) came he did it, all the goalkeepers do it, and Alisson is doing it as well, of course.

“It is normal goalkeeper training. It makes sense to do it because the six-yard area is rather a proposal than a safety box for a goalkeeper.

“We have these situations in training constantly. When we do set-pieces the box is full with 22 players. Maybe that is a bit much, but 15 certainly!

“It is busy, we do it often so that the goalkeeper gets used to that. It is all about timing.”

Klopp is confident that Alisson will pass the test against Palace as Liverpool look to build on their opening weekend win over the Hammers.

As well as commanding his penalty box, the shot-stopper showcased the quality of his distribution on his debut and that will be crucial again as the Reds look to quickly turn defence into attack.

“First of all, we brought him here because of the things that he is already good at. That is what we want him to do,” Klopp added.

"It is not that the goalkeeper has to change completely now for this league, we have to help him too in situations.

“There is not just one player responsible for something. We have to have the right formation around set-pieces, all that stuff. In the game it is not that different, but set-pieces are quite different here.

"So far it was absolutely okay. In the West Ham game we were for sure not taller than West Ham. We really have an eye on defending set-pieces. But it is not solely about Alisson, but the whole team."