The England international still needs to pass a medical and finalise contractual terms after his involvement at Euro 2020 but Treble-winner Irwin cannot wait to see the 21-year-old pull on the red shirt.
He believes the signing is one that has excited the fan-base and will provide more attacking options for Ole Gunnar Solskjaer next term.
"He's a fantastic player," Irwin told us. "I mean you look at the Bundesliga last year and the amount of goals and assists he made for Borussia Dortmund. He's got good experience, even though he's a young lad, as Dortmund are a big team with big support, they've got great support there.