Celtic defender Matthews facing three months on sidelines
"My initial fears are it could be a fractured collarbone. If that's the case then he could be out for three months," Lennon said after the match.
"It puts a negative on what has been a great day.
"I thought it was a penalty. He has taken Adam's leg first then followed through on the ball. I don't blame Lasley - it's more down to Adam falling awkwardly."
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