Richard Naylor will miss the rest of Ipswich's season after suffering a recurrence of his neck problem.
The defender slipped a disc in his neck in the autumn and made a brief return last month before the problem returned.
Ipswich boss Jim Magilton told the club's website: "Bam-Bam (Naylor) has seen a specialist and we are waiting for the results.
"It looks like he may need an operation and if that is the case then we won't see him playing again until pre-season."
On-loan Crystal Palace striker Shefki Kuqi is also out of action for this weekend's trip to Scunthorpe after he suffered a hamstring injury on his second debut for the club last weekend.