Martin O'Neill hopes both Kieran Tierney and Kasper Hogh can play a part for Celtic against St Johnstone.
The pair have missed two and three games respectively but were back in training today ahead of tomorrow evening's trip to McDiarmid Park.
The champions face Simo Valakari's men in Perth, an 8pm kick-off.
O'Neill was delighited to welcome the important duo back to training.
He said: "Well, we've got Kasper Hogh back the last couple of days, Kieran Tierney did a little bit of work with us this morning first time back, so we'll have a look to see how they are.
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"We've got a couple of other fitness issues for players, but we'll try and go as strong as we possibly can."
Asked about their chances of featuring tomorrow, he added: "Yeah, obviously Kasper's had the extra day, we'll see how they are tomorrow night."
Yang is another player who will be missing as he takes part in the Asian Games with South Korea.
The manager was quizzed on whether Camilo Duran will be pushed back wide, with Hogh through the middle.
He responded: "Yeah, I'm pleased to have it at the moment. We'll see how we're fixed obviously at some stage or another.
"Whatever we do, if everybody is absolutely fit, then it's a matter of trying to get your best players on the field."
