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Newcastle manager Eddie Howe was dealt another blow after striker Alexander Isak seemed to pick up an injury and was spotted limping down the tunnel after he was substituted shortly after Gordon's red card.
The pundit took a sympathetic tone, acknowledging that he had made similar mistakes on the pitch himself.
Keane said: “There was an incident about maybe one or two minutes before that, it’s obviously frustrating, it’s a moment of madness – I do feel for him, listen I’ve done daft stuff on a football pitch.
I’m not going to be too harsh on him, it’s daft, he’ll have to take his medicine.”
On what the Magpies need to do next, Keane added: “The test for this group is how they recover from it.
Roy Keane labeled Anthony Gordon's challenge as "daft"
He said the club would "possibly" appeal, as the decision seemed "harsh" on first viewing, and shared Gordon's reaction afterwards.
Howe said: “Well it looks harsh but we’ll have to analyse it properly – I’ve not seen a replay of it, I’m just going on my original view
I thought it looked harsh but we’ll see and see what we do next.”
Then asked if he would appeal the decision, Howe replied: “Possibly.” Howe was then asked whether he believed Gordon lost control of his emotions in that moment.
He added: “I don’t know, I think I’d need to see it again properly to see exactly what happened
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