However, it might not matter. The Red Devils grabbed a 2-0 advantage in last week's first leg in Amsterdam.
The second leg is on Thursday, and while Rooney will miss it because of a throat infection, United shouldn't be in too much trouble. Kickoff is set for 3:05 p.m Eastern, with American TV coverage on GolTV.
We'll fire up the live blog around 2:45. See you then.
Follow Mike on Twitter: @MikeCummings37
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Manchester United: David De Gea, Rafael, Fabio, Chris Smalling, Phil Jones, Park Ji-Sung, Ashley Young, Nani, Tom Cleverley, Dimitar Berbatov, Javier Hernandez
Subs: Ben Amos, Patrice Evra, Jonathan Evans, Michael Carrick, Ryan Giggs, Paul Scholes, Danny Welbeck.
Ajax: Kenneth Vermeer, Vurnon Anita, Jan Vertonghen, Toby Alderweireld, Dico Koppers, Ricardo Van Rhijn, Nicolas Lodeiro, Siem De Jong, Christian Eriksen, Miralem Sulejmani, Aras Ozbiliz
Subs: Jacobus Cillessen, Andre Ooijer, Daley Blind, Ismail Aissati, Lorenzo Ebecilio, Thulani Serero, Davy Klaassen.
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Manchester United: Javier Hernandez (6')
Ajax: Aras Özbiliz (37'), Toby Alderweireld (87')