Former star has hailed the impact of midfielders , and in helping win the title - without having to make signings. The Reds finally clinched their crown on Sunday after a 5-1 thrashing of , sealing a 20th top flight title.
Slot's men have cruised to the title with four games remaining, after watching nearest rivals fall away from contention, after losing just two games all season.
have been by far the most consistent team thanks to some superb goalscoring displays from , who has netted 28.
But the Reds were also boosted by some excellent midfield performances from Gravenberch and MacAllister, who have formed an outstanding partnership in the middle of the park, while boyhood star Jones has also played his part with some worthy displays from 16 league starts.
There were initially question marks when Liverpool made just one signing last summer by snapping up Federico Chiesa from for £12m, thought the Italian has barely played for the club. and Hamann said the trio had been "rejuvenated" by Slot, who has focused on developing the squad he inherited from .
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“Klopp bought quite a few players in his last season and it did improve," he told talkSport. "What we must forget is that no player came in last summer and only Chiesa came in late in the window.
“What he did is rejuvenate Gravenberch and Curtis Jones because they have been regulars. Gravenberch has been outstanding, probably a contender for Player of the Season. Players who haven't played much last season were like new signings.
"Curtis Jones was a bit-part player, he's played more games than ever. The big difference has been Gravenberch and Mac Allister in the middle of the park, they have been brilliant."
Jones managed three goals and three assists this season while Mac Allister and Gravenberch registered eight assists between them, proving to be a real force both technically and physically.
Hamann - who played 280 times for the Reds and won the with them in 2005 - still doesn't believe Liverpool need to sign too many players again this summer after praising the core of their squad, but says Slot could do with a new striker after being left unimpressed by Darwin Nunez.
The German added: "If Liverpool keep most of their team together - they've kept Salah and van Dijk but I'm still not sure what will happen with , he's most likely to go. You've got Conor Bradley there so many you need a full-back who can cover at centre-back.
"The position they will look for is a centre-forward. As willing and hard-working as Nunez is, he simply doesn't put enough chances away. That's the only posiiton I would be looking at. It would be close to three figures, if not more. He is probably the best centre-forward. The other one they're talking about is Liam Delap from Ipswich. Isak was at [Borussia] Dortmund when he was 17-18, it was probably a bit too early.
"Isak would certainly be a player who would improve them. Every now and then they do spend big but are not the biggest spenders. If there's a price tag of 80,90, 100 million - I know they paid it for VVD which was well worth it - I'm not too sure this is what they want to do."
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