The champions were beaten by Crystal Palace in Sunday's Community Shield.
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But Hamann told BBC Sport: "I think they are the team to beat, the expectations will be different, because last season Slot did a wonderful job, but the expectations were probably, ‘if we finish in the top four, we’ve done ok,’ so they ended up running away with the league.
"Now this year, with the signings they’ve made as well, with winning the league by ten points or more last season, everybody chases them.
"Everybody wants to knock them of their perch and they are the team to catch and expectations will be different, it will be interesting to see how the team handles it."