AC Milan coach Stefano Pioli said he is unsure whether veteran striker Zlatan Ibrahimovic will retire from playing at the end of the season, with the Swede still out of action with a knee injury. Ibrahimovic's contract expires at the end of the current campaign, with the 40-year-old yet to sign a new deal, despite widespread reports in the Italian media saying he will do so. He has started just 11 Serie A games this season, with Pioli adding that Ibrahimovic will again be missing for Milan's clash with Genoa on Friday.