A knee injury has prevented the big forward from featuring for Glasgow since joining up from Saracens but he's at No.8 for Saturday's Premiership match.
Kaleem Barreto starts for Marr while Sam Yawayawa and Grant Stewart turn out for Hawks.
Ayr host Boroughmuir with Robbie Nairn, Stafford McDowall and George Stokes starting for the Millbrae men.
Hamilton Burr is in the Stirling County squad to face Heriot's at Bridgehaugh.