Toulon - Defending European club champions Toulon have apologised to Leicester for the behaviour of their players following last weekend's defeat to the English side and pledged to open an internal investigation.
Leicester won 25-21 in a heated European Rugby Champions Cup group match on Sunday.
Toulon said on their website on Wednesday that they decided to open an investigation after Leicester complained about the behaviour of prop Martin Castrogiovanni and fullback Delon Armitage.
Castrogiovanni, a former Leicester player, allegedly used "insulting terms" toward Leicester sporting director Richard Cockerill, as Cockerill was giving a post-match news conference, while Armitage is also alleged to have insulted spectators at Welford Road.
Toulon said they "will punish the players if deemed necessary," and "takes the opportunity to offer its apologies to Leicester Tigers for the inconvenience caused."