Young Ajax fan Jay-Jay Willems got his wish of signing for the Dutch outfit in an event organised by the club's foundation.
According to 101greatgoals.com, the eight-year-old, who suffers from a chronic illness, was welcomed into the club after they heard of his condition.
A video produced by the Dutch outfit showed Jay-Jay being unveiled at a press conference alongside manager Frank de Boer, as well as taking part in a first-team warm-up.
The youngster has IBS abdominal ache.