The Football Association have granted the extension to next Thursday after both teams reached the Champions League final, with club officials required to travel to Moscow to plan for the showpiece later this month.
He was pictured clashing with Chelsea ground staff after a row thought to be sparked by United's players using the penalty area.
Yet to be resolved is whether Evra was abused in the lead up to the incident, with Carlos Tevez being quoted as saying his team-mate received a "grave insult".
The FA have requested Chelsea's CCTV footage of the incident and want to gather "all relevant information" before deciding what action to take.
United boss Sir Alex Ferguson said earlier this week that his club have sent a report to Soho Square.
"We've filed a report, sent it to the FA and we're delighted with that," he said.