Pearce reckons all three transfers will be done and dusted by the close of play on Monday though.
And he’s claimed a surprisingly low fee will be enough to prise Aubameyang away from Dortmund.
"Now, Arsenal’s next move of course will be to try and confirm the deal with Pierre-Emerick Aubameyang, who was once again left out of the Dortmund squad last night," he told BBC Sport’s Football Focus.
BBC SPORT
BBC Sport reporter Jonathan Pearce reckons Pierre-Emerick Aubameyang will join Arsenal by Monday
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"And he should come in for a fee of around about £35m.
"But, all of those deals, I think will be confirmed by Monday."
Aubameyang could make his Arsenal debut against Chelsea on Wednesday night, although Mkhitaryan is cup-tied for the Carabao Cup clash.
Sanchez, meanwhile, is poised to make his first United appearance when they take on Yeovil in the FA Cup next Friday.