Cesc Fabregas admitted his frustration Tuesday over his recent inconsistent performances for Barcelona.
The Spain international midfielder, who revealed his displeasure at not playing every minute of every game, was substituted only 63 minutes into Barca's narrow victory over Valencia on Sunday.
Despite starting all three La Liga games so far this season, Fabregas remains far from happy playing a cameo role for his boyhood club, having returned to the Nou Camp last summer for 30 million pounds ($47.6 million) after eight years at Arsenal.
"There's no such thing as a great substitute in the world of football," he said.
Fabregas said, however, that he doesn't let his frustration affect him when he's with his teammates.
"I always wish my teammates well and put a happy face on," he said. "If I have to take my unhappy face home then so be it, but I would never let my teammates or manager see it."
"Everybody likes to play every minute of the season," he added.
"I've always said that I play for the best team in the world, but I came here to compete, to learn and enjoy, not to sit wracking my brains," he said. "The manager knows what I can offer. But across the three positions that I can play, I am competing with the three best players in the world."
Fabregas said he's happy to be with Barcelona, "but when a coach tells me I have to go, I'll go.
"But I will not make it easy for him to do so, by any means. I will keep going, looking forward to the time that things change. I came here to see out my career."
Information from Press Association was used in this report.