Petr Cech, John Terry, Eden Hazard and Samuel Eto'o have all trained for Chelsea ahead of Wednesday's UEFA Champions League clash with Atletico Madrid.
Cech missed Sunday's 2-0 victory over Liverpool at Anfield after he was replaced in the first leg of the Champions League semi-final with a dislocated shoulder injury following a collision with Atletico's Raul Garcia.
But the goalkeeper has told Sky Sports he is fit to play in this week's return leg at Stamford Bridge, when Chelsea and Atletico will battle it out for a place in the final after a goalless draw in Spain.
Asked if he was fit as he strode out on to the training ground, Cech replied: "Of course."
Cech was then seen training on his own, throwing and catching the ball - although not diving on his injured shoulder.
Skipper Terry, who injured an ankle in the match at the Vicente Calderon Stadium, joined Cech in training on Tuesday to give Chelsea a major lift, after Jose Mourinho claimed prior to the Liverpool match that both players were likely to miss the remainder of the campaign.
It would still be regarded as a risk if Mourinho, who suggested Cech would require an operation, selects the goalkeeper.
Mark Schwarzer came on for Cech at the Vicente Calderon and offers an experienced alternative, having kept a clean sheet against Liverpool at the weekend.
Alan Curbishley has told Sky Sports News he will be surprised if Cech plays against Atletico.
"I think it's a bit of mind games with Petr Cech," he said. "I really think he needs to be diving around - forget about throwing the ball out.
"He needs to be diving - landing on his shoulder. I'd be surprised if he was fit.
"The other three are a big boost - if I'm Atletico Madrid - no disrespect to Petr Cech - I'd be more concerned about the outfield players being available."
Whoever is fielded in goal, Chelsea need the defensive reinforcement talismanic skipper Terry would provide.
Terry could come in alongside Gary Cahill, with Ashley Cole dropping out for Cesar Azpilicueta at left-back and Branislav Ivanovic at right-back, reuniting Mourinho's preferred back four against Atletico.
Striker Eto'o and influential attacker Hazard were also back in training on Tuesday at Cobham after recent lay-offs.
Hazard last played in the 2-0 victory over Paris Saint-Germain on 8 April, while Eto'o was last involved in the defeat by Sunderland 11 days later.
The availability of any of the quartet would provide a boost for Mourinho, who is without suspended midfielders Frank Lampard and John Obi Mikel as well as ineligible pair Nemanja Matic and Mohamed Salah.