Pep Guardiola claims winning all four trophies this season is "an illusion".
The Manchester City manager believes it is far too early in the season to be talking about the quadruple.
City are 15 points clear at the top of the Premier League, through to the last 16 of the Champions League and into the Carabao Cup semi-finals.
They begin their FA Cup challenge with a home tie against Burnley today.
Guardiola said: "Maybe that question can be asked in March or April if we are still in all four competitions. But tomorrow is the third round of the FA Cup. So thinking about four competitions, it's an illusion, it's not realistic."
Guardiola made headlines when he suggested the heaviness of the festive fixture schedule was "going to kill" players.
But asked if he might field younger players, he said: "No way. We are going to try to play the best team that's possible, because we play against Burnley. Against Huddersfield (last season), we needed a replay."
Guardiola insists his complaints about the Christmas programme were not about the number of fixtures, but the close proximity of the games on December 31 and January 2.
He said: "All the doctors, physios, say that in 48 hours, the body does not recover to play again in a demanding competition. But we have to adapt. It is what it is."
Guardiola expects a tough challenge from Burnley, who have been led to seventh in the Premier League by Sean Dyche.
"What he has done so far is amazing," said Guardiola. "They have had amazing results. It's a tough draw for us."