The 46-year-old frontman is determined to persuade Jason, who quit in 2014, and part-timer Robbie Williams, 43, to be involved in the group's milestone celebrations.
Gary - who is also joined by Mark Owen and Howard Donald in the man band - told Magic Radio: ''We are going to hopefully maybe get Robbie on board and get Jason on board. It might be the 30th anniversary that we end up celebrating.''
Gary - who is currently head judge on his BBC talent show 'Let It Shine' - is adamant that one day Robbie and Jason will return at some point and he has assured fans that they are back for good.
He previously said: ''We're at the point in our careers where we feel more excited than we've ever been.
''I do picture doing more solo stuff in the future.
''It's been a few years since I've done that.
''I don't think there's ever going to be an announcement that says, 'Take That is finished', I really don't.
''I just think it may be different. It may be four. It may be three, it may be five. I think it's always going to be changing, that bit.''
The 'Could It Be Magic' hitmakers celebrate 25 years together in 2017, but won't be performing live to celebrate for some time afterwards as they want Robbie - who embarks on a solo tour this year - to join them on stage.
Gary recently said: ''We are still trying to work out the reunion.
''We are looking at a tour in 2018 and we'll drop the album at the very end of next year. But these things can change, at the moment that's what we are hoping for. Robbie will hopefully come along but Jason is happy staying where he is for now.''
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