Athletic Bilbao manager Ernesto Valverde is eager to test Manchester United in Dublin today.
Athletic will treat the preseason friendly seriously.
"This is a strong game against a very high-level opponent," he said. "What we hope is to compete at our best level, to be able to stand up to them and, of course, win. It's what we want.
"All the teams are fine-tuning and finalising our preparation for the start of the championship.
"It is good for us to measure ourselves against a rival of that calibre, more than anything because of the start of the League that we have."