Ballack has not played since limping off against Newcastle
Chelsea have been rocked by the news that Michael Ballack and Ricardo Carvalho will miss Tuesday's Champions League semi-final against Liverpool. The Blues lead 1-0 after the first leg but midfielder Ballack is likely to miss the rest of the season after having ankle surgery on Friday.
The 30-year-old picked up the injury in the early stages of Chelsea's goalless draw with Newcastle last weekend.
Defender Carvalho, 28, sustained a knee problem against Bolton on Saturday.