Hector Bellerin has urged patience at Barcelona for coach Xavi.
Xavi is under pressure after failing to reach the Champions League round of 16.
But former Arsenal defender Bellerin says: "I always give the example of (Jurgen) Klopp with Liverpool and (Pep) Guardiola with (Manchester) City.
"They did not win when they arrived at their teams in England and in the end there have been two winning projects.
"In the team we have enthusiasm and things well done take time. We trust Xavi 100%, he is the ideal coach for Barça."
Bellerin also told Cataluyna Radio: "Football is neither black nor white, there are many aspects and situations that can affect a team and that reflected in the result. The team signed a lot this summer, we're also having a lot of injuries and a project like this needs time to start getting results."