London - Stoke defender Robert Huth is being investigated by the Football Association after apologising for a series of explicit interactions he made on Twitter.
Huth has landed himself in hot water after responding to a Twitter account which posts sexual images of individuals.
The account invites users of the social media site to guess from cropped photographs of people in explicit poses whether those pictured have male or female genitalia.
A series of tweets posted from Huth's official account showed the 30-year-old German playing the game.
On Friday, with the interactions with the other account having been deleted, he posted a message saying: "Clearly no offence was meant or directed to anyone, but apologies if I've offended anyone."
But that may not be enough for the former Chelsea defender to avoid FA punishment.
Huth has already received criticism from the transgender community and in October the FA handed QPR defender Rio Ferdinand a three-match suspension, as well as a £25 000 fine, for comments he made on Twitter.
Ferdinand directed a jibe at a Twitter follower containing the word 'sket', which was understood to be a slang term taken to mean a promiscuous woman.