Windass, the former Rangers, forward was allowed to leave Ibrox by Steven Gerrard earlier this summer.
The striker scored only three goals for Celtic but his record since leaving is even worse.
The striker failed to feature for new club Metz and has headed to Africa.
Celtic striker Amido Balde is reportedly set to join Metz.
Celtic manager Ronny Deila is reportedly planning a clearout this summer.
Celtic's Amido Balde has signed a new deal to move to Hapoel Tel Aviv on loan.
The Portuguese youngster will have to be at his best to win favour with Neil Lennon