Norwich City are set to assess Liam Gibbs after he limped out of Tuesday's 2-2 draw with Sheffield Wednesday with a thigh injury.
The midfielder was on the pitch for only three minutes at Hillsborough after replacing Josh Sargent on 61 minutes. After a quick burst up the pitch, he went down requiring treatment.
Gibbs headed straight down the tunnel and was visibly upset by the setback. It comes as the latest bump in the road for the youngster, who has endured a stop-start campaign with the Canaries after his breakthrough last term.
David Wagner confirmed that Gibbs' injury looked to be serious, with further assessment set to take place before Saturday's trip to Preston North End. There will also be caution over defender Shane Duffy.
"It's his quad," Wagner said on Gibbs. "It's an injury. For sure (we will have to scan it). I think it looks like a more serious quad injury if you come on and can't continue. We have to assess it.
"(Shane) Duffy was tired after the last games. We can't take any risks with the thin squad that we have.
"Danny Batth has always played very well, is a super pro and I think he has done very well today. Now, we have to continue to find solutions for the next game."
Gibbs' injury blow is the latest in the long line of concerns with Jon Rowe, Jacob Sorensen, Dimi Giannoulis and Onel Hernandez also missing.
After Saturday's victory over Ipswich where City expended a lot of physical and mental effort - Wagner was pleased there was no slump in their efforts at Hillsborough, even if they squandered a two-goal lead.
"From the first second they were switched on, and after this high, we have known that with a victory we could really back up what we have done on Saturday," Wagner said.
"This was the aim and how the players played, but we haven't finished the job. I would have liked to have six points - this is a normal reaction after the two performances.
"In football, you don't always get what you wish - you get what you earn. We only earned one point because of not being ruthless."
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