OXFORD United's pre-season 'double-header' against Peterborough United will now take place next Wednesday.
The U's were due to host the Sky Bet Championship side at their training ground on Tuesday, with two matches taking place side-by-side.
But the behind-closed-doors friendly has been pushed back to Wednesday (1pm) to allow United's self-isolating players to be available.
The U's announced on Tuesday that three members of the first-team squad had tested positive for coronavirus, forcing a further nine to self-isolate as a precaution.
United have already called off Saturday's friendly at Birmingham City's training ground.
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