Former Celtic manager Gordon Strachan believes the club must solve the mystery of their "Bermuda Triangle" in defence to get back on track in the title hunt.
Neil Lennon has chopped and changed his defence on many occasions throughout the season, with a litany of injury issues affecting his ability to play a first choice back-line.
Christopher Jullien 's impending months-long injury layoff meant he missed out on Saturday's derby match against Rangers.
His replacement, Nir Bitton, went on to make a game-changing error in an area Strachan has identified as Lennon's main problem position at left centre-back - an area of the park where he reckons the ball enters only to suddenly reappear in the Celtic net moments later.
Bitton was sent off for bringing down Alfredo Morelos on the break and the ex-Scotland boss thinks it's crucial that part of the pitch is sorted out.
Strachan told Football Pass : "Most of the mistakes Celtic make come in the left centre-back position.
"Whether you play two centre-backs, three centre-backs, it's that area that seems somehow like a Bermuda Triangle when they run out there.
"The ball goes in there and it disappears from them, it ends up going somewhere else and there's a goal or a mistake being made.
"That's a big fault on that left side. And they've played Duffy over there, Ajer's been over there, Bitton ended up over there the other day.
"So it seems to be like that's a problem area."
