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Jurgen Klopp believes Roberto Firmino and Trent Alexander-Arnold will be ready for the start of Liverpool's Premier League campaign.

The Reds duo only kicked off pre-season in France this week but should be involved in Saturday's friendly against Napoli in Dublin.

They will then have a further eight days to prepare for Liverpool's clash with West Ham at Anfield.

Firmino, who plundered 27 goals last term, has returned from his holiday following the World Cup in "good shape".

"He changed something with his hair, I am not 100% sure what. I think now it’s black? I didn’t see it but I heard during his holiday it was silver but that’s the only difference," Klopp joked.

"All the rest is like it was when he left. It’s good to have him here, he looks in good shape. Training for the outfield players is obviously different than for the goalies, but we want to see him as well against Napoli. We will see for how long.

(Image: Andrew Powell/Liverpool FC via Getty Images)

“When we start against West Ham, he will have had then two weeks after three weeks off, it should be possible but we will see.

“In the moment he looks good, his programme is obviously pretty different. He is part of most of the sessions when the boys do something different that is not the highest intensity, so then he needs to do a little bit more, like Trent will do now. Step by step, they are all coming back and it’s the best news.”

Alexander-Arnold reported to Evian on Tuesday and started pre-season on Wednesday - five days earlier than scheduled such was his desperation to get back to club duty.

Fellow England international Jordan Henderson also wanted to cut short his holiday but Klopp insisted that he had an extended break. He will return to Melwood, along with Simon Mignolet, on Sunday.

“It was not (possible) to stop (Trent coming back), but then without physical power it wouldn’t have been possible to keep Hendo away either,” Klopp added.

"But Hendo is in a different situation and played much more games, played more in the World Cup and all that stuff. He is not old, but he is older than Trent, so I think it makes absolute sense he has the full three weeks and Trent has had two weeks and two days.

“Trent seems to be really relaxed and really desperate to be part of the team again, so good to have him and now we can start with him.

"You want to have the boys all together and all around. In Trent’s case, it looks like he is still growing. You see him after five weeks and it’s like ‘something is different'. Maybe here a muscle or there a muscle.

“We want to be together, we enjoyed last season together and want to have a better one this time so the earlier we can be together the better it is.”