A young Manchester United side secured a late draw as Facundo Pellistri struck in the 93rd minute against ten-player Athletic Club in Dublin on Sunday afternoon.
A mistake from Harry Maguire saw Athletic turn over possession and open the scoring through Nico Williams, who raced through the middle and finished well in the first half
However, Pellistri levelled things up with a half-volley from Maguire's header.
Manager Erik ten Hag unsurprisingly made wholesale changes from the XI that beat Lens 3-1 at Old Trafford on Saturday, with starts handed to Maguire, Christian Eriksen, Donny van de Beek and Jadon Sancho among others.
Sancho was in on goal inside three minutes having been played through by Pellistri but couldn't convert, seeing his effort hit Unai Simon's outstretched leg.
Maguire's first moment of hesitation nearly cost United in the tenth minute, failing to effectively clear Oihan Sancet's cross before Inaki Williams's header was smothered by Tom Heaton.
Athletic began finding rhythm against United's youngsters and fringe players as Inigo Ruiz de Galarreta missed comfortably from range. The Red Devils did show a threat of their own as Facundo Pellistri burst into the box and went down under the challenge of Dani Vivian, but his appeal for a penalty was ignored.
It was the La Liga side who struck first in painful and familiar fashion for United fans. Maguire gifted the ball straight to Sancet who slipped in Nico Williams, whose prodded effort hit Heaton and spun into the far corner.
De Galarreta eventually picked up a booking for one heavy challenge to many as Victor Lindelof headed as Simon from Eriksen's corner as the rain started heaving down at the Aviva Stadium.
Young defender Gore went close from Eriksen's set-up,
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