Gerardo Martino wants improved performances

Barcelona boss Gerardo Martino has called on his side to overcome their recent wobble.

The Spanish outfit recently lost back-to-back games against Ajax and Athletic Bilbao, and have come under criticism for a change of style this season.

However, Martino, speaking at a press conference ahead of Wednesday's Champions League clash with Celtic, has insisted that performances and results will improve.

"Given the implications for Barcelona in every game we play, for ourselves it's always important to win, to be first and to give a good performance," he told reporters.

"We have to separate ourselves from any possibility that we'll have any easy games. All games have consequences, more negative than positive.

"This is a game for us to reinforce what we did the other day and it's a game in which we have to play better and for us to finish the group as leaders. This is a very important game for us."

Barcelona have already booked their spot in the knockout stages of the Champions League.