Martin O'Neill has revealed Kieran Tierney picked up a slight injury during Celtic's win over Falkirk.
With captain Callum McGregor and striker Kasper Hogh already missing through illness and injur respectively, Tierney had to be replaced after 70 minutes of today's 2-1 victory at Parkhead.
His manager originally thought he was just suffering from cramp but it became clear it was an actual injury.
He explained pre-match that the club were managing Hogh's injury without giving too much away about it, and now says the left-back's issue looks similar.
He told BBC Radio Scotland: "Kieran came off. I thought it was cramp he’d had, but it wasn't. It looks quite similar to Kasper in that sense.
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"I’m genuinely not sure at this minute. I need to find out from the physios and medical staff about how that is, but we'll see."
Meanwhile, the 74-year-old was pleased with Haissem Hassan's performance on the wingers first start.
He added: "We keep encouraging him to do that. That's the reason we took him on here. He’ll cause problems in the final third of the field. I think he will be terrific for us.
"He flicks the occasional one that we’re not totally convinced about, but overall, I was delighted with his performance. I thought he was great and caused them problems."
