Laurent Blanc has warned he will play younger players if necessary after Edinson Cavani showed his displeasure at being substituted in Paris Saint-Germain's 4-1 victory over Troyes.
Cavani scored the opening goal -- a superb cushioned volley from Angel di Maria's chipped pass -- while Zlatan Ibrahimovic, Layvin Kurzawa and Jean-Kevin Augustin were all on target before Troyes' Thomas Ayasse netted a stoppage time consolation.
But the Uruguayan striker was less than impressed at being replaced 10 minutes from time.
"Cavani wasn't very happy, I can confirm that," PSG head coach Blanc said at his postmatch news conference. "But they are never happy and I can understand that.
"If established players have no motivation, we will play young people.
"They will be happy to play, but I think the established players that I have are currently serious."
Victory means leaders PSG have now won nine in a row in the league and are guaranteed to head into the mid-season break top of the table.
But Blanc was putting little importance on that achievement, saying: "The title of autumn champion? Good to take.
"It's a good thing in so far as it confirms that we have a lot of points.
"It is not a certainty to be champion. We take this honour but we must have the determination to take the points to be champion."
France defender Layvin Kurzawa called it a "beautiful evening" as PSG played at home for the first time since the November 13 terror attacks on their city.
Ibrahimovic's 85th goal in the top flight equalled the club's all-time Ligue 1 goal-scoring record, his cool conversion from the penalty spot taking his tally to 10 goals in as many league games.
"It's a beautiful evening for us and for our fans," Kurzawa was quoted as saying on the L'Equipe website.
"I hope it will continue like that. You want to not lose and try to win every game to come. But we also know that it will be complicated.
"[Being autumn champions) means nothing. For me, what counts is to be champion of France in late season."
The match was preceded by a series of tributes to the victims of the attacks which killed 130 people in the capital, with a huge French flag on the pitch and another formed by cards distributed to spectators.
The club anthem "O Ville Lumiere" and the French national anthem were both played before a prematch minute's silence and a video tribute from famous faces from the world of sport.
PSG's players again bore the slogan "Je Suis Paris" on their shirts on an emotional evening.