Arsenal and Manchester United will replay their FA Cup quarter-final on Friday should Saturday's Old Trafford clash end in a draw.
United's ongoing Champions League commitments, continuing with Marseille this Tuesday, plus the upcoming international double header mean no midweek dates are available before the semi-finals, leaving next weekend as the only available slot.
That would mean the ongoing battle for Premier League supremacy would be put on hold until April as United's match against Bolton and Arsenal's trip to West Brom scheduled for next weekend would be postponed.
A rare Friday fixture would be necessary because on Saturday, Tottenham are due to entertain West Ham in a televised London derby, so the Metropolitan Police would not consider a second game in north London. On Sunday, planned trackwork on London's tube would disrupt travel to the Emirates Stadium, leaving Friday as the only viable option next weekend.
Another weekend fixture may also be required if Manchester City and Reading finish level on Sunday, although that replay is scheduled for April 2 as the Blues are due to meet Chelsea at Stamford Bridge in a televised Premier League game next weekend.