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Bottema-Beutel adds that they should not regard ABA as the “gold standard,” a claim that is made based on the supposed solidity of the underlying scientific research.

They have struggled for defensive solidity all season, with the derby win just their second clean sheet of the campaign.

The club is said to want a manager who can bring some solidity and discipline to the squad after the heavy defeat by Spurs.

Celtic were able to trouble teams in attack in previous seasons, but lacked the solidity to back it up.

The change in formation to a 4-4-2 also seemed to add more solidity.