But he can't see any reason why the Reds can't take the title after claiming another big scalp on Sunday with a 1-0 home win against Western Sydney Wanderers.
Adelaide have toppled league leaders Brisbane Roar and the second-placed Wanderers in consecutive games.
Gombau's outfit on Sunday rose from ninth to fifth on a cluttered A-League ladder, stretching their unbeaten run to six games - but the Spaniard said it was premature to talk of United as a legitimate title chance.
"It is early to say this. Honestly, it's not in our plan or our mind," Gombau said after his gifted Argentine Marcelo Carrusca scored the match-winner against the Wanderers.
"It is more to build this project and, in the long-term, fight for this (title).
"What we need to is go game by game."
Even so, Gombau said a title was possible.
"Why not?," he said.
"The teams are very equal, why not ... you never know.
"But honestly, our philosophy is to create this club in the long-term.
"Of course we want to win every single game and we will fight for every single game and if, in the end, we are in the finals - perfect.
"But not now, to win two games and think to be the champions, because there are a lot of very good teams in the league."
In other round 15 action, Wellington Phoenix continued their form surge with Saturday's stunning 5-0 defeat of Melbourne Victory.
"We have threatened to do it several times but we dominated the game from end to end ... it all came together and now the challenge is to repeat that," Phoenix boss Ernie Merick said.
Also Saturday, Central Coast Mariners downed Sydney FC 1-0 to leave the Sky Blues' coach Frank Farina seething.
"I expected a better reaction after the goal. If I'm not going to get that then I'll try players that hopefully will," said Farina.
On Friday night, Melbourne Heart ended its 19-game winless stretch with a 3-1 triumph against a lacklustre Newcastle Jets, while Perth Glory played a scoreless draw with Brisbane Roar.