Erik Lamela insists he will only make his Roma debut once he has totally recovered from a left ankle problem.
There are hopes that he could be ready for action by the end of this month, but he doesn't want to rush his comeback.
"I would like to be at 100 per cent before making myself available to boss Luis Enrique," the Argentine told the Gazzetta dello Sport.
"I've been unable to train that much with the squad so far and obviously I'm not at my best right now, but I'm looking forward to playing for my new club."
The 19-year-old, who picked up his injury at the Under-20 World Cup, was netted from River Plate for a fee that could rise to €19m depending on bonus clauses.
Roma have had a rough start to the season, having been dumped out of the Europa League and losing their opening Serie A game 2-1 on Sunday against Cagliari.
"I thought Roma played quite well versus Cagliari," the South American added. "Unfortunately things didn't go our way.
"I'm not concerned about our start to the season though."
The capital outfit are next in action this weekend when they face Inter at the Stadio Giuseppe Meazza in Milan.