Sergio Perez says he has switched his focus to the Monaco Grand Prix after a disappointing race day in Barcelona saw him fail to finish for the first time this season.

The Mexican had been one of the stars of qualifying after posting the sixth quickest time, which then became fifth after the exclusion of Lewis Hamilton from the results.

Any hope Perez had of matching his Sepang heroics however were all but ended on the first lap, when contact from the Lotus of Romain Grosjean going through the opening corners saw him pick up a puncture.

Dropping to the rear of the field as he returned slowly to the pits, the Sauber man then set about trying to make up places only for a transmission issue to force him into retirement, with the Mexican now hoping for a return to form next time out on the streets of Monte Carlo.

"We have been very unlucky at the start," he said. "In turn one I managed to get passed Romain, but then he hit me and I had to pit after lap one. We could not really recover from the back of the field, and later I had to retire because of a transmission problem.

"Whatever it was, it is over and I will be focusing on the next race. Monaco is a very special Grand Prix for me."

Perez endured a difficult Monaco debut last year, being forced to miss the race after a heavy shunt in qualifying.