The Reds have won just one of their six fixtures so far in 2017, with that coming in the 1-0 victory at Plymouth Argyle in the FA Cup third-round replay last week.
More recently, Swansea City claimed a 3-2 victory at Anfield on Saturday to ensure Liverpool suffered a first home defeat of the campaign – and a first loss in L4 in almost exactly a year.
Of those six games, Mane has been on Africa Cup of Nations duty with Senegal for five of them, but Klopp insists that is not the only reason for their fluctuating form.