Milan - Juventus midfielder Andrea Pirlo is set for scans on a calf problem on Wednesday amid fears he could be ruled out for several weeks.
Pirlo pulled up before half-time in Juve's 2-1 Champions League last 16, first leg victory over Borussia Dortmund in Turin.
Coach Massimiliano Allegri confirmed Pirlo had gone "off with a calf problem" but Italian media are speculating the 35-year-old, who missed the start of the season due to injury, could be out for a month.