The Belgium international suffered a calf injury in the 2-0 win over Paris Saint-Germain, a problem which is set to rule him out of the first leg of the semi-final
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His absence was felt on Saturday as Chelsea slipped to a 2-1 home defeat to Sunderland and he is unlikely to return in time for the first leg at the Estadio Vicente Calderon on Tuesday.
There was some good news on the injury front for manager Jose Mourinho, however, with Petr Cech involved in the training session.
The Czech Republic international fell ill before the loss to Sunderland and replaced by Mark Schwarzer, but looks to have recovered in time to face Atletico, though Branislav Ivanovic will definitely miss out through suspension.