The midfielder had been set to miss the Old Trafford fixture and Tuesday's Champions League opener with Young Boys, after Brazil invoked the five-day rule on their Premier League internationals who did not play in World Cup qualifiers after receiving call-ups.
Ole Gunnar Solskjaer hoped common sense would prevail, as travelling to South America would have meant 10 days in quarantine upon return, and described it as a 'lose-lose-lose' situation for all parties involved.
The South American federations have now agreed to waive the rule following extensive discussions with FIFA.
This means Alisson, Fabinho, Roberto Firmino (all Liverpool), Thiago Silva (Chelsea), Ederson, Gabriel Jesus (both Manchester City) and Raphinha (Leeds) are all eligible again this weekend.