Each of the Republic of Ireland under-21 international's six appearances so far have come from the bench - four of them coming this season.
His debut came as a late substitute against Chelsea in the Premier League in November 2023; the Galway-born 21-year-old has since made two further appearances from the bench in the league, two in the Carabao Cup and one in the FA Cup, and spent the second half of last season on loan with Bolton Wanderers.
But the defender is in from the start at St. James' Park for his first outing in the Champions League as Eddie Howe makes six changes to the side narrowly beaten at Manchester City at the weekend.
More to follow.
**Newcastle United:** Aaron Ramsdale, Kieran Trippier (c), Sven Botman, Joelinton, Sandro Tonali, Harvey Barnes, William Osula, Jacob Murphy, Nick Woltemade, Dan Burn, Alex Murphy
**Substitutes:** Nick Pope, John Ruddy, Aidan Harris, Lewis Hall, Yoane Wissa, Anthony Gordon, Anthony Elanga, Joe Willock, Leo Shahar, Sean Neave