The former international hurt his shoulder while doing some warm-up drills and did not bowl during the Plunket Shield match against Northern Districts in Whangarei this week.
The game promised an exciting finish but came to a damp end with the weather intervening yesterday.
Otago was 101 for three at stumps on day three. It had a lead of 205 which it was hoping to stretch into a tempting target for Northern to chase but the game was called off early.
The draw snapped a six-game losing streak for the Volts and there were some other positives to emerge from the fixture.
Derek de Boorder batted nicely to score 89, while leg-spinner Michael Rippon took four for 73.
But the injury to Craig has cast shade on an improved showing.
''He jarred his shoulder and we managed it quite conservatively,'' Walter said.
''He will go and see the doctor [today] and then we will get a better idea of exactly what is going on. We will have to wait and see to see the severity of it.''
Otago's next assignment is against Auckland at the University Oval beginning on March 25.
The Volts are likely to be without batsman Shawn Hicks for that match. He pulled out of the game against Wellington in Dunedin earlier this month when he picked up a concussion after he was struck on the helmet while fielding in close.
He has a history of concussion from his rugby-playing days and is going through the return-to-play protocols.
''He still has a few small signs of concussion so we have to wait until those have cleared up entirely before he can start his return to play.''
Player safety was brought into sharp focus this week with the first-class game between Canterbury and Auckland in Rangiora abandoned because the pitch was ruled dangerous.
''You have to be wary making any judgement based on a few video clips,'' Walter said.
''But it must have been fairly significant for them to go the route of calling it off because that does not happen very often.
''Safety is paramount and a few guys got hit on the body and one on the head I think, so it became a safety concern.''
In the other match to finish yesterday, Central Districts hung on to snatch a draw against Wellington at the Basin Reserve.
Set a target of 372 to win, CD finished the day at 108 for eight wickets after, at one stage, slumping to 15 for four.
