Sky Sports have explained why Rangers were not awarded a penalty against Celtic at Parkhead during today's Old Firm derby.

The Ibrox club looked to have been denied a blatant spot-kick when Celtic defender Alistair Johnston handled the ball out for a corner in the first half.

VAR official Willie Collum reviewed the incident but he did not suggest that a review should take place.

Sky Sports later explained that a penalty was not given due to Abdallah Sima being offside in the build-up.

Commentator Ian Crocker added: "It would have been nice if he'd told us that earlier."

The Herald:

More to follow.