Those are the words of Guingamp boss Jocelyn Gourvennec.
The Newcastle loan striker ended a nine-game barren streak with both goals in Guingamp's 2-0 Europa League victory over PAOK on Thursday.
He is a player that promised so much, but rarely produced under Alan Pardew.
Manager Gourvennec is challenging 28-year-old Marveaux to seize the chance to revitalise his career.
Sylvain Marveaux - Never looks the finished article
Jocelyn Gourvennec: "For Sylvain to become a great player again, it takes consistency and to be decisive in these matches.
"When he plays like that, he's a very influential player in a role that suits him perfectly.
"He can help us progress now, and hopefully move up.
"He feels very much at home, he's a class player.
"And when a class player feels good, it changes the play of the team.
"But for that, there must also be some movement around him.
"He can string together performances now at this level, and he must stay at that level and not slip away from it."