Liverpool left back had just needlessly lost the ball and committed a foul in a bid to get it back. Whether Klopp 's frustrations were just at Robertson, at Marriner or a culmination of both events coming together is anybody's guess.
But Klopp's frustrations were clear. And, according to the Liverpool Echo, it wasn't the only time Klopp was asking that question at St Mary's.
Liverpool went on to lose the clash 1-0, their second defeat of the season. The result also follows a 1-1 draw with West Brom and a 0-0 draw with Newcastle.United, now level on points with their bitter rivals, have the chance to go top should they win their game in hand.
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