It's unknown how long either player will be on the sidelines, but they will definitely miss Killie away.
There is also another defensive injury blow in the shape of Stephen Welsh, fresh from signing his new four-year deal at the Scottish champions.
"Really pleased for him. He's a guy that loves Celtic and loves playing here. He's been a great player here within the squad over the last couple of years. Alistair Johnston is back in first-team training at Lennoxtown. He was pictured with his teammates earlier today.
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