New Arsenal signing Krystian Bielik played for the under-21s in their win over Stoke, but not in his usual defensive midfield role.
Bielik started the game at centre-back, moved out of midfield to accommodate senior players.
Aboui Diaby, Jack Wilshere and Mikel Arteta all started in the 4-1 win over Stoke, which saw Alex Iwobi grab a hat-trick and Stephy Mavididi notch the other.
It was only Bielik's third appearance for the under-21s, previously featuring in a 1-0 loss to Derby and a 2-1 win over Newcastle, along with the under-18 side, and a friendly match with Brentford a week ago.
It will certainly have been an interesting experience for Bielik to play behind Arteta, Wilshere and Diaby, so he could watch their positioning, and actions, as he continues his learning experience at the club.
The 17-year-old was one of two signing Arsenal made in January along with Gabriel Paulista, signing from Polish side Legia Warsaw.
He is yet to make a first team appearance and is not expected to before the season is over, with Arsenal battling hard in the Premier League and in the FA Cup semi-finals.
Arsene Wenger is not likely to call upon Bielik to answer a defensive crisis either should one arise, but playing him at centre-back is a nod to his versatility, and it is a position in which he may yet get starts for the first team as his career steadily progresses.
At over 6ft 2, the teenager has the physical stature not to be intimidated in the position, and his versatility will bode well for him as he aims to get as many minutes under his belt at any level to continue his development.