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Liverpool boss Jurgen Klopp said Diego Costa was "not the nicest guy," and he "could never be friends" with him after the Chelsea forward won a controversial penalty during a 1-1 draw at Anfield on Tuesday.
Reds defender Joel Matip was adjudged to have fouled Costa in the area to hand the visitors the chance of all three points. However, Costa's resulting spot-kick was saved low to his right by goalkeeper Simon Mignolet.
After the match, Klopp spoke of his frustration over the penalty award.