When 18-year-old Marcus Rashford scored the winner against Manchester City in his breakthrough year of 2016, he lit up the Etihad with a beaming smile — and United would love that version of their poster boy for Sunday's derby.
Rashford will know better than anyone he has not been at his best this season, but his career statistics suggest it's not due to a lack of commitment.
He has averaged 50 games a season for eight seasons — which doesn't happen without being durable.
He clearly has a strong mindset and the capacity to be available through physical discomfort and indifferent form.