Joel Matip has been hampered by an ankle problem since joining Jurgen Klopp’s side in the summer on a free transfer The defender has been sidelined with an ankle ligament problem since the 2-2 draw with West Ham on December 11. Matip, 25, who underwent surgery on his ankle in the summer before joining on a free transfer after his contract expired with Schalke, admitted he may have aggravating an existing problem. “It’s getting better and in a few days I hope I’ll be back in full training,” the German-born Cameroon centre-back told the club’s official website.