Iraola says he's seen a change of tactics from the Clarets.
He explained, "They've changed their approach a bit. They aren't risking so much and they are more direct.
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"They have introduced players who are playing very well, such as (Wilson) Odobert, (David Datro) Fofana and (Lorenz) Assignon who give them other things."
On whether he feels a trip to Turf Moor will be challenging, he added: "It's not going to be an easy game, It cost us a lot to win here at home.
"We have to forget what happened in the cup, physically recover and make an effort for the third time in a week."