The one-time Rangers youngster was allowed to leave Ibrox by Steven Gerrard earlier this summer.
The new Celtic signing, Liam Burt, has made no secret as to his true colours after rejoining the Bhoys from Rangers - five years after he left Parkhead for Ibrox.
Burt joined Celtic on trial earlier this summer, having been among those let go by their Glasgow rivals Rangers at the end of last season.
The 20-year-old has since signed up with Neil Lennon's side until 2021 and moved quickly to clarify any confusion surrounding his Celtic or Rangers allegiance.
He posted the following message on Instagram earlier on Wednesday:
View this post on Instagram
Burt only played three times for Rangers - but never under the current Gers boss, Gerrard - and had in recent seasons spent time on loan with Alloa Athletic and Dumbarton.
The Rangers goalkeeper, Aidan McAdams, made the reverse switch after leaving Celtic in 2017.
Will Burt make Rangers regret releasing him after joining Celtic?
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