The Owls Under-16s and 18s host Birmingham on Saturday at Middlewood Road and the kick-off time is now at 1.00pm.
The games were originally set for an 11.30am kick-off but have been put back by 90 minutes.
Supporters are welcome to attend the fixture at the Owls’ training complex.
Wednesday’s Under-18 side have drawn back to back games in the Professional Development League against Burnley and Barnsley.
Andy Holdsworth’s side sit third in the division just one point behind joint leaders Leeds and Nottingham Forest.