Xavi said his Barcelona team must fight for titles next season, as he acknowledged second place was the highest finish realistically available to them in La Liga this term.
Barcelona earned a hard-fought 1-0 win over Real Sociedad on Thursday, and go into Sunday's home contest with Rayo Vallecano 15 points behind league leaders Real Madrid with just 18 points left to play for.
The Catalan giants' victory in the Basque Country, secured courtesy of Pierre-Emerick Aubameyang's first-half header, kept them six points clear of fifth-placed Real Betis as Xavi attempts to lead his team to Champions League qualification.
Xavi, however, recognizes that improvements will be needed next season, acknowledging that while second place is the best Barcelona can hope for this term, "only winning" counts at Camp Nou.
"We are playing a lot, [qualification for] the Champions League and second place [are our targets]," he told reporters at a news conference on Saturday. "The league [title] is very difficult.
Finish as high as possible
"We have dropped a little in terms of the game compared to a few weeks ago. If we recover, we will be closer to results. We must finish as high as possible, which realistically is second place.
"Since November in the league we've been fighting with Madrid. Next year we have to fight to win titles, here it is only worth winning.
After suffering back-to-back home losses to Eintracht Frankfurt and Cadiz, Barcelona are looking to avoid losing three consecutive games at Camp Nou for just the second time in their history when they host Vallecano, having only previously done so under Louis van Gaal in 1998.