The Blaugrana midfielder is expecting a three-way scrap for this year's Spanish title, while teammate Marc Bartra feels the Catalans took a step forward against Villarreal.
The Blaugrana lead La Liga by three points from the Rojiblancos, which host Valencia at the Vicente Calderon on Sunday evening.
Los Blancos sit third, two points behind their city rivals having played a game more, but Busquets is expecting a three-way fight until the end for this season's title.
“There’s a lot left to the league and our advantage is important," the Spain international told reporters after Saturday's 2-1 win over Villarreal. "All three teams [Barca, Atletico and Madrid] are equal.”
Meanwhile, Barca defender Marc Bartra feels that the Catalans have now put last month's back-to-back defeats at Ajax and Athletic Bilbao firmly behind them.
“We took a step forward," the 22-year-old said after a Neymar double at Camp Nou. "There was an eagerness and intensity within the team.
“Victory is very important because it was against one of the best teams in La Liga.”