Quique Setien says Barcelona should still be seen as joint favourites to win La Liga along with Real Madrid, ahead of his team's clash with Getafe on Saturday.
Barcelona, second, face Jose Bordalas's side at Camp Nou and can pull level with Madrid if they win, before their rivals host Celta Vigo on Sunday.
Madrid are in good form and have winger Eden Hazard poised to return from injury, while Barcelona forward Ousmane Dembele was recently ruled out for six months with a hamstring tear and striker Luis Suarez is still sidelined.
"Many leagues are decided by small details, that none of the teams fighting for the title can control," Setien told a news conference on Friday.
"I think we are exactly equal favourites with Real Madrid. We have three points less but we have a game against them there."
Barcelona hope to be allowed an emergency signing to replace Dembele, pending ratification from the Spanish FA on the French winger's medical report following his operation this week.
Getafe forward Angel Rodriguez has been linked by Spanish media, along with Levante's Roger Marti.