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New signing Tommy Setford has been allocated the number 36 shirt at Arsenal.
36 is the lowest academy number and the closest to the first-team squad.
Setford, who signed from Ajax, will technically be part of the U21 squad but is set for frequent involvement in first-team training.
The 18-year-old has immediately linked up with the first-team squad for their pre-season tour of the USA.
He is one of four young goalkeepers on the trip along with Karl Hein (who is in the first-team squad), Lucas Nygaard and Alexei Rojas.