Spain midfielder Cesc Fabregas is unhappy at being only a bit-part player for Barcelona this season, but is determined to make an impact at the Nou Camp.
The 25-year-old returned to his boyhood club from Arsenal in a £30million deal last summer.
However, under new manager Tito Vilanova, Fabregas has found his chances limited and is yet to complete a full 90 minutes this season, being an unused substitute against Real Madrid in the second-leg of the Spanish Cup last week.
"There's no such thing as a great substitute in the world of football - I couldn't tell you what makes a great substitute", the former Gunners captain told Marca.
"I always wish my team-mates well and put a happy face on. If I have to take my unhappy face home then so be it, but I would never let my team-mates or manager see it.
"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."
Arsenal still hold first option to re-sign their former talisman.
But Fabregas added: "I am delighted to be a part of this team, but when a coach tells me I have to go, I will 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."
