Injuries to Joe Lolley and Sam Byram marred Nottingham Forest’s Carabao Cup win against Newcastle and both players are currently being assessed.
Byram limped off just before half-time in the dramatic 3-1 victory while Lolley went off as the hour mark approached.
Both players are nursing knee injuries and could be doubts for Forest’s Championship game at Brentford on Saturday.
“I do not know how serious they are. The medical department and the doctor will have a look at that,” said Reds boss Aitor Karanka after the match on Wednesday night.
“They have knee injuries, yes. But I have not had the chance to speak to them for more than a few moments. The doctor does not know yet how bad it is.”
Newcastle have been criticised for their display at the City Ground, where their only shot on target was Salomon Rondon’s equalising goal in injury time. That cancelled out Daryl Murphy’s second-minute opener for the hosts but further goals in injury time from Matty Cash and Gil Dias saw Forest progress to the third round.
Magpies manager Rafael Benitez insisted after the defeat that his side’s below-par performance did not concern him, although he struggled to find many positives.
“The positives today? Rondon scored a goal so you have to have your strikers scoring goals,” he said. “(Sean) Longstaff and (Jamie) Sterry did well. They are young, they overall played well.”
The inclusion of the two academy products were among seven changes made by Benitez.
