After finding out he will be without Stephen McGinn for a month with a fractured cheekbone, Mackay has also learned fellow midfielder MichaelBryan will be out for a fortnight with an ankle injury.
"There indeed had been concern among several family members about the circumstances around Michael's death, " said Bryan Monroe, the last journalist to interview Michael Jackson.
The U.S., who are without Andy Roddick or Mardy Fish, will look to the Bryan brothers (Bob and Mike) to edge them into the lead tomorrow as they face Michael Llodra and Julien Benneteau.