Andre Villas-Boas insists he will not abandon his principles in order to bring Alex back into the first-team fold to ease Chelsea's defensive problems.
Alex has been training away from the squad since Villas-Boas revealed earlier this month that the Brazilian defender, along with Nicolas Anelka, had submitted a transfer request.
However, with Branislav Ivanovic and David Luiz unlikely to be fit to face Fulham on Boxing Day, there has been a suggestion that Alex could be recalled to partner captain John Terry.
Blues boss Villas-Boas, though, believes it would be wrong to turn to Alex, even in an emergency, and stands by his decision to exclude the centre-half from his plans.
"He's not going to play," Villas-Boas said. "Because we have accepted a transfer request in anticipation of the market and we are not stupid people.
"We don't push out people who submit transfer requests and put people apart to then dial 911 and ask for help.
"So, at the moment, we will stick to our principles and to our values.
"It was a decision we thought was good for the club.
"The request was accepted, so we have to let the market open and we have to continue to adapt ourselves if situations like this continue to arise."
Asked if he now regretted acting so hastily with Alex, Villas-Boas said: "That was a decision that we felt sensible and competent at that time and we will stick to it."
Villas-Boas reiterated why Alex and Shanghai Shenhua-bound Anelka were banished in the first place, with the decision also partly a response to Chelsea's worst start to a season since Roman Abramovich bought the club.
He said: "We went on that run of results and we wanted everybody on the same tune regarding training and the same tune in terms of commitment, concentration and objectives - immediate club objectives.
"So it was not a thing to penalise anybody. It was just to fine tune the environment that we have."
The Chelsea boss was also coy over Alex's desire to leave, something that would appear to stem from his slide down the pecking order to third choice as John Terry's partner.
"Everybody has ambitions," Villas-Boas said. "We are speaking about an extremely professional player and personality and I think he had his personal ambitions and that's why we accepted."