Chelsea winger Eden Hazard could miss the club's most important games of the season with his calf injury.
The initial prognosis for his absence is between two and three weeks although the results of a scan are expected today.
The timescale is tight, with Chelsea's semi-final first leg due to be played in less than a fortnight.
Ahead of the second leg of their Champions League semi-final, they are then due to face Liverpool at Anfield on April 27 although this could now take place on April 26.
