Sean missed the 34-20 win against Ulster last Saturday because of a calf-muscle injury.
Glasgow have named a squad of 25 players for the cup match. Andy Kelly and Fergus Thomson have been added to the 22 who were on duty for the Celtic League match against Ulster.
Indications today are that Sean and his fellow Scotland cap, Gordon
Bulloch, will be fit for Sunday. However, Fergus has been added to the squad as precautionary cover for Bulloch, who took a knock on an abdominal muscle in the first half of the match against Ulster.
Sunday's match will kick off at 1.00pm. Glasgow's squad of 25:
Backs:
Graeme Beveridge
Andy Craig
Andrew Henderson
Calvin Howarth
Rory Kerr
Kenny Logan
David Millard
Graeme Morrison
Sean Lamont
Dan Parks
Sam Pinder
Forwards:
John Beattie
Gordon Bulloch
Lee Harrison
Andy Hall
Andrew Kelly
Scott Lawson
Donnie Macfadyen
Cammy Mather
Euan Murray
Jon Petrie (captain)
Fergus Thomson
Kevin Tkachuk
Dan Turner
Andrew Wilson
NOTE: Glasgow XV for Sunday's match will be announced at the Palace of Art, Paisley Road West, Glasgow, on Friday (22 October) at 11.30am.