The former Kaizer Chiefs central defender’s deal also has a two-year option, meaning he could be a Celtic player for at least four years depending on whether the team is happy after the initial two years.
Lawler spent a frustrating spell at Chiefs, where he started two matches all season after joining Amakhosi at the start of the campaign.
The 22-year-old's arrival at Celtic could open a door for Erick Mathoho to finally make his move, expected to be Kaizer Chiefs, as Celtic have been on record saying they could let Mathoho leave if they found a replacement.
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