Just when it seemed Liverpool might finally falter, Sheffield United goalkeeper Dean Henderson allowed Gini Wijnaldum's shot to squirm out of his grasp and into the net. And so Jurgen Klopp's men march on. It's seven wins out of seven, but this one was far from straightforward - and Liverpool were far from convincing.  Klopp admitted as much afterwards, saying they had "lost their rhythm" and conceding that Sheffield United deserved at least a point. But is it not a sign of champions to grind out a victory in this manner? The front three failed to fire, but this game was a reminder that in Virgil van Dijk, they have a match-winner at the other end too. The Dutchman was a colossus, making more clearances than anyone else and winning 12 out of 14 aerial duels. At other times, he was simply in the right place at the right time, ending Sheffield United attacks through nothing more than smart positioning. Liverpool will need to rediscover their attacking fluency in the weeks ahead. But with Van Dijk in this kind of form, they can at least be confident of keeping their opponents out.