Isak is pushing to leave for Liverpool this month and was left out of today's squad for the trip to Aston Villa.
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Asked if the controversy has brought the squad together, Burn told Sky Sports: "I think so. I think there's obviously a lot of external noise. We've got quite a tight-knit group and we just get on with it.
"I think we've now been about four or five weeks without Alex, so for us he's obviously not involved at the moment.
"But we've got players who need to step up and contribute to the goals and we're ready to go."
