Duo leave Sunderland by mutual consent
Midfielder Blinco, 20, joined the club from Darlington in 2012 and he made an instant impact with the club’s Under-18 side, playing a key role as Elliott Dickman’s side reached the U18 Premier League semi-finals.
After cementing his spot during the following season, the Durham-born youngster made a number of cameos for the Under-23s before joining Norwegian side Bergsoy on loan in March 2016.
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Hide AdHe also had a loan spell at Conference North side Boston United.
Meanwhile, fellow midfielder Pybus, 19, made the step up to Under-23 level at the start of the campaign after scoring 15 goals in 23 games for the under-18s last season.
A Sunderland statement read: "The club would like to wish the duo well in their future careers."
On deadline day, Sunderland allowed three youngsters to leave the club on loan.
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Hide AdAndrew Nelson, Tom Beadling and Oliver Pain have all swapped the Stadium of Light for first-team action elsewhere.
Striker Nelson joined neighbours Hartlepool United, while goalkeeper Pain has signed for SPL side Motherwell until the end of the season.
And centre-half Beadling has been snapped up by League One outfit Bury.