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Alistair Johnston left the field on a stretcher as Celtic were held at home
Alistair Johnston will be out for "about 12 weeks", says Celtic manager Brendan Rodgers after the right-back sustained a hamstring injury in the 0-0 draw with Kairat.
The Canada international, 26, was withdrawn after 35 of the Champions League play-off first leg.
Johnston has made 115 appearances since joining Celtic from CF Montreal in early 2023.
Brendan Rodgers' side face Kairat again in Kazakhstan on Tuesday (17:45 BST) after hosting Livingston in Saturday's Scottish Premiership match (15:00).
"Not great, he'll probably be about 12 weeks," said Rodgers.
"For Ali, we just want to make sure that we're in a really good position in all competitions when he gets back."
Scotland right-back Anthony Ralston, 26, replaced Johnston on Wednesday and Rodgers said his "first look" was to replace from within with Coby Donovan cited by the manager as another option for right-back.
Rodgers also gave an update on other fitness concerns.
"Adam Idah's struggling with his knee," the manager explained.
"Auston Trusty could be out for a bit with a plantar fascia issue that he's had.
"Daizen [Maeda], we've probably had to use him more that we would've liked but he's okay. A bit stiff and crampy."