Northern Ireland pair Paddy McNair and Conor Bradley are injury concerns ahead of Monday night's Euro 2024 qualifier against Kazakhstan.
The defenders did not train with Michael O'Neill's squad on Sunday as they continue to nurse knocks sustained in Friday night's 1-0 defeat to Denmark.
One positive is Craig Cathcart did take part in Sunday's session after missing the defeat to the Danes because of a back spasm.
Read more: N Ireland vs Kazakhstan TV and live stream info for Monday's game
O'Neill said: "We've got a little bit of a doubt about Conor Bradley and Paddy McNair who both sat out training today. Conor hyperextended his knee in the first half (on Friday night).
"He was able to play on and he was fine but I think he’s improved considerably and he feels a lot better in himself, but we have to give both those lads as much time as possible to give them the best chance of being available for selection. Paddy has just had a bit of an Achilles injury and we’ve had to manage him through this week a little bit."
On McNair, O'Neill added: "He’s got through the training session so obviously that’s a positive. We just need to see how he reacts the rest of the day.
"The nature of that injury, overnight he could stiffen up again or feel uncomfortable but we’re optimistic with the fact he came through today that he will be available tomorrow."
Meanwhile, captain Jonny Evans says the mood in the Northern Ireland camp is positive despite Friday night's late heartbreak when Callum Marshall's equaliser was ruled out following a lengthy VAR check.
He added: "Yeah, there was frustration. I actually spoke to someone who was at the game and I think the fans were quite buoyant after the game.
"The emotion of scoring the goal, alright it got taken away, but it gave everyone that feeling. For young Callum, scoring the goal, to get that feeling hopefully it makes him more hungry and for us as a team it shows we can go and compete and score goals away from home.
"Alright it was offside but they were very fine margins."
Meanwhile, Aberdeen winger Mattie Kennedy has withdrawn from the squad and been replaced by uncapped Carl Johnston of Fleetwood Town.
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