Celtic winger James Forrest has reportedly been ruled out of the squad to face AC Milan in the Hoops' Champions League encounter on Wednesday evening.

The 22-year-old was an initial doubt after missing Celtic's 3-1 victory over Hearts due to an ongoing sciatica problem.

Forrest, who has been unable to recover from the issue, is also suffering from an illness, resulting in his absence from the travelling squad at Glasgow airport this morning, according to BBC Sport.

Celtic will later face Ajax and Barcelona in Group H of the Champions League.