The Poland international has continued his prolific goalscoring form at the Catalan club since his summer move, in Thursday's Europa League clash at the Camp Nou he will no doubt be looking to add to his tally.
As a former defender, Irwin, who played at the iconic stadium on three occasions during his playing days, is a great source of advice on how to deal with such an attacking threat.
Ahead of the highly anticipated match, he offered an insight into what the United defenders will be thinking before coming up against Lewandowski.
“There’s no doubt that the centre-halves, whoever plays, are well aware of his capabilities,” Irwin told club media.