The goalkeeper and defender were forced off through injury and are now doubts for Sunday's clash with Liverpool, as the visitors stifled the Liga leader at the Vicente Calderon.Chelsea earned a credible 0-0 draw with Atletico Madrid in Tuesday's Champions League semifinal first leg, though Petr Cech and John Terry were forced off because of injury.
The goalkeeper and captain were both withdrawn, while midfield duo Frank Lampard and John Obi Mikel will miss the return encounter through suspension, along with Atletico skipper Gabi, after picking up yellow cards on Tuesday.
Chelsea's two injury setbacks - Cech has suffered a suspected dislocated shoulder - are also a huge blow for Jose Mourinho ahead of Sunday's crucial Premier League title clash with leaders Liverpool as the London club continues to chase silverware on two fronts.
Goalmouth action was scarce in a tight affair at Vicente Calderon, with Chelsea seemingly content to drop deep and escape the Spanish capital with a clean sheet.
Much of Atletico's success under Diego Simeone has been built on lethal counter-attacking play, but Chelsea's game plan forced the Liga leader to take the initiative. The hosts were unable to break down a stubborn visiting back line, which was expertly led by Terry, who left the field in the 73rd minute after twisting his left ankle.
Cech had already gone off in the first half, while Lampard, Mikel and Gabi were all booked in quick succession as tempers frayed slightly.
Much was made of the availability of Atletico goalkeeper Thibaut Courtois against his parent club and Fernando Torres returning to his old stomping ground, but neither player was heavily involved as Chelsea stuck rigidly to frustrating its opponents.
After a quiet opening, Chelsea was dealt a blow in the 18th minute when Cech had to be replaced by Mark Schwarzer after landing on his right arm in a challenge with Raul Garcia.
Ramires wasted a rare opening for the visitors 10 minutes later, flashing a cross-shot across goal with Torres in support after Willian had led a counter.
Garcia headed a half-chance over the crossbar before Mario Suarez curled a 25-yard effort narrowly wide of the right-hand upright 11 minutes before halftime.
Cesar Azpilicueta had to be alert in the 41st minute, throwing himself in front of Diego Costa's well-struck volley as Atletico continued to make most of the running.
Lampard fizzed a left-footed volley straight at Courtois in the opening exchanges of the second half before Diego shot straight at Schwarzer after an unconvincing punch from the Australian.
Following Terry's withdrawal, Gabi saw a free kick well held by Schwarzer low down to his left in the 76th minute and substitute Arda Turan headed wide at the back post shortly after.
Atletico continued to press in the final stages. Costa heading straight at Schwarzer with the team's final chance in stoppage time, and the two sides will return to London next week with the tie finely poised.