Johnstone and Oliver unavailable. Tidser and Waddell available. MacLean joins Falkirk. Tiffoney available.
Morton finished 2018 on a high as they won 2-1 at Partick Thistle. Two breakaway goals from Scott Tiffoney and Charlie Telfer made the difference on a day when their defence excelled.
The win at Firhill was needed as Morton hadn't tasted victory since early November. The three points at Partick keeps them on the fringes of the race for the play-offs.
Morton look set to remain without strikers, Denny Johnstone and Gary Oliver into 2019.
Michael Tidser and Kerr Waddell are set to return from suspensions. Scott Tiffoney is available although his loan expires on Sunday.
On loan winger, Ross MacLean, has cut his loan spell short and accepted a move to Falkirk.
Morton have endured a mixed first half of the season at Cappielow. Their nine home fixtures have produced three wins, three draws and three defeats.