But with Freddy Eastwood, Bellamy and Robert Earnshaw ahead of him in the forwards pecking order, Cotterill may not have even got on the pitch against Germany.
It is considered that he will benefit more from a full game with the youngsters instead, for their opening Uefa Under-21 Championship qualifier against France in Grenoble on 7 September, the day before the seniors face Germany in Cardiff.
After Germany at the Millennium Stadium on 8 September, Wales face Slovakia in another Group D qualifier in Trnarva four days later.
Wayne Hennessey, 20, is expected to keep his place in goal after remaining unbeaten in three appearances.
His Wolves team-mate Eastwood, 23, could also have done enough to earn a starting spot in attack alongside Bellamy, if Toshack opts for a formation that incorporates two forwards.
Eastwood scored on his debut in Bulgaria and impressed with his hard running and direct approach.
Full-backs Chris Gunter and Neil Eardley, both 18, who were added to the senior squad in Bulgaria for experience, return to the Under-21s
Flynn has retained the players who did so well in Sweden, which means 16-year-old Arron Ramsey, the Cardiff youngster, will win his first competitive cap at this level.
Wales squad to play Germany on 8 September in Cardiff and Slovakia on 12 September in Trnarva:
Hennessey (Wolves), Price (Derby), Coyne (Tranmere), Bale (Spurs), D Collins (Sunderland), J.Collins (West Ham), S Evans (Wrexham), Gabbidon (West Ham), Morgan (Peterborough), Nyatanga (Barnsley), Ricketts (Hull), Crofts (Gillingham), S Davies (Fulham), Fletcher (Crystal Palace), M Jones (Wrexham), Koumas (Wigan), Ledley (Cardiff), Llewellyn (Wrexham), Robinson (Toronto), Bellamy (West Ham), Earnshaw (Derby), Eastwood (Wolves), Nardiello (QPR).
Wales U21 squad to play France in Grenoble on 7 September:
R Taylor (Chelsea), O Fon Williams (Crewe), Eardley (Oldham), Gunter (Cardiff), Jacobson (Bristol R), N.Taylor (Wrexham), Mike Williams (Wrexham), R.Williams (Middlesbrough), Allen (Swansea), Blake (Cardiff), D Edwards (Luton), James (Southampton), MacDonald (Swansea), Ramsey (Cardiff), Church (Reading), Cotterill (Wigan), C Evans (Man City), Vokes (Bournemouth).