According to Goal, the 23-year-old has been invited by Celtic coaches Lehlohonolo Seema and John Maduka to train with Siwelele with the hope of signing the player.
Letlotlo was released by Chiefs at the end of last season after returning from a failed loan stint with Baroka FC.
The Chiefs development academy graduate failed to cement his place in Amakhosi senior team, having graduated in 2016 after his impressive displays for the Chiefs reserves in the Diski Challenge.
Letlotlo made only six appearances for Chiefs across all competitions in his three seasons with the club.
He was first linked with a move to Glad Africa Championship team Royal Eagles in KZN but the move did not materialise.