With the game at the Gtech Community Stadium sandwiched between our two Europa League semi-final ties against Athletic Club, the head coach is wary of the need to prioritise next Thursday's Old Trafford encounter with the Bilbao-based outfit.
With a healthy 3-0 advantage from the first leg, United are looking to clinch a second trip to the Basque city by completing the job and facing either Tottenham Hotspur or Bodo/Glimt in the final later this month.
Harry Amass, Tyler Fredricson, Jaydan Kamason, Sekou Kone, Bendito Mantato and Chido Obi were all part of the 26-man squad that travelled to Spain and could be in the frame to feature in the capital on Sunday.