The Togolese striker is believed to be unhappy about a lack of game time this season but Villas-Boas insists that he has simply been sidelined with injuries and not because of his mentality.
"We're quite happy with his attitude," he said.
"He had an injury which took him out for six games and then another injury took him out for two games. We have the injury records if you want to look at them.
"From the 11 games that we've played, I think he's been out for eight of them and he wasn't here at the start of the season.
"In the games when he was available he showed the quality striker that he is. We have no doubts whatsoever. We have him fit now and hopefully ready for the next upcoming games. We know his ability."