Robbie Williams may be unable to fully commit to Take That.

The 39-year-old singer has until March to decide whether he wants to help the band - which includes Gary Barlow, Howard Donald, Jason Orange and Mark Owen - pen tracks for their new record since he has solo commitments which may clash with the band's plans.

An insider told The Sun newspaper: ''The schedule will all be planned in the coming weeks and writing sessions organised for the new album.

''Gary and the boys want Robbie back but he has yet to make a concrete decision. He has his own tour this year and is going to be busy with that.

''He has until March to decide whether he wants to be part of the writing process.''

Robbie initially left the band in 1995 while the remaining members completed their world tour which ended in Amsterdam and the boys later released a final single, a cover of The Bee Gees' 'How Deep Is Your Love', before splitting up in 1996.

They reunited as a four-piece in 2006 for a tour around the UK but it wasn't until 2010 that Robbie joined the them for their sixth studio album, 'Progress'.

Take That have plans to release their 7th studio album later this year before kicking off their stadium tour in 2015.