John Terry, Petr Cech, Samuel Eto'o and Eden Hazard have all trained with the Chelsea squad ahead of their Champions League semi-final second leg clash with Atletico Madrid.
Cech was replaced by Mark Schwarzer in the first half of the 0-0 draw in Madrid last Tuesday following a collision with Raul Garcia and was expected to miss the remainder of the season with a dislocated shoulder that may require surgery.
But the 31-year-old shot stopper has told Sky Sports News that he is fit to play on Wedneaday if called upon.
Terry also limped off in the Spanish capital with an ankle injury and missed the weekend victory over Liverpool. Manager Jose Mourinho revealed during his press conference last week that the Blues skipper had a small chance of being passed fit for Wednesday's game at Stamford Bridge despite initially fearing his earliest possible return date would be for the Champions League final.
The return of both key players would work as a significant boost to Chelsea's hopes of reaching a third Champions League final in seven seasons.
41-year-old Schwarzer and 20-year-old centre half Thomas Kalas deputised in their places to great effect in the 2-0 win at Anfield but Mourinho is likely to reshuffle his squad for the visit of the La Liga leaders on Wednesday.
Hazard meanwhile has not featured for the club since coming off with a calf injury in the quarter final second leg victory over Paris Saint Germain on 8 April but is now in line for a return along with Samuel Eto'o, who has spent 10 days on the side-lines after suffering a knee injury in the defeat to Sunderland on 10 April.
A resolute defensive performance in the Spanish capital from the Blues sees Wednesday's game evenly poised as Atletico attempt to reach their first final in this competition since 1974.