Steven Anderson's red card at St Mirren last week rules him out, while fellow centre-back Frazer Wright will also miss the game after going over the penalty-points threshold.
Skipper Dave Mackay still has one match to go of a two-game ban, while midfielder Chris Millar is also banned after being red carded in the 1-1 draw against the Buddies.
McCracken had to have surgery after picking up the injury when he clashed heads with Celtic midfielder Victor Wanyama during the 1-1 draw at Parkhead on November 11.
The former Dundee United stopper was expected to be out for six weeks but Lomas said: "We will have a chat about it.
"David has been training non-contact for a while but I won't be taking a chance on him.
"I wouldn't do anything like that, we will take advice from the doctor."
- Sports & Recreation
- Frazer Wright
- Chris Millar
- Steven Anderson