Despite his side sitting comfortably alongside Manchester City on 16 points at the summit, Mourinho was eager to cool talk of a two-way battle for the title, as he believes that as many as six teams are likely to compete at the top.
"It's too early. I know that last season on this fixture I think we would have, maybe, five or six points less than we have this season," he told reporters. "So we are better this season than last. But this is nothing.
"It's just a start. A difficult period with an accumulation of matches that comes in October. Difficult. I really think that six teams are going to fight for the title."
Champions Chelsea are two points further back on 13, while Tottenham Hotspur and Liverpool have 11 points apiece after six games.