Adam Matthews has revealed that Ronny Deila told Celtic's players to eat a chunk of butter, cheese, or cream before matches when he was in charge.
The Welsh full-back joined the Parkhead club in 2011 and played one season under Deila, who was appointed manager in 2014 following Neil Lennon's departure.
The Norwegian was just 38 when brought to Glasgow's east end.
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Although Matthews hailed Deila's coaching abilities, he lifted the lid on one of his stranger routines: "It was a different transition, a different culture," he said [RecordSport].
"He was a very good coach, but his diet was a bit weird.
"I remember he used to say, eat a chunk of butter or cheese and cream for pre-match, which I don't know if they do it in Scandinavian countries, but it's not what we're used to. So a lot of players weren't happy with that.
"But he was a very good coach and he did well at Celtic. I enjoyed playing for him. It was just different to what I'm used to, being with Lennon for my first three seasons. It was a big change for everyone."
Deila departed Celtic in 2016. He won two Scottish Premiership titles and one League Cup as he faltered in the Scottish Cup semi-finals, once to Inverness and once to Rangers.
He has since taken charge of Valerenga, New York City, Standard Liege, Club Brugge, Al-Wahda, and now finds himself at MLS outfit Atlanta United.
Deila's club currently sit 12th in the Eastern Conference, 15 games into the 2025 season.
