Troubled pop star Justin Bieber has been dealt a fresh blow after British boyband The Wanted axed his collaboration from their upcoming album. The group recorded a track with Bieber for the new record, Word Of Mouth, but they have now warned fans not to expect to hear their song with the Baby hitmaker. They have also dropped a collaboration with pop singer Rita Ora, but bandmember Siva Kaneswaran insists the songs may be released in the future. He tells Digitalspy.co.uk, "We wrote with Justin and Rita, but for all of us, we've always said that if a song was right to release, we'd release it. They're great songs, but in regards to our sound right now and the album, they weren't right... "We still have them and we can still use them and put them out at the right time." Word Of Mouth will hit stores in September (13). The news comes amid further troubles for Bieber, 19, who is currently the subject of a police investigation over allegations his entourage was involved in a brawl in New York earlier this month (Aug13). He hit headlines again on Monday (12Aug13) when a series of nude snaps appeared online.