The deal is subject to regulatory approval.
Gabriel Jesus and Noni Madueke scored Arsenal’s goals in the encounter, while Jean-Philippe Meteta netted Palace’s consolation.
The circumstances behind the deaths of the siblings remained unclear as of press time.
United will face Brighton on the final day of the season.
Rosenior’s dismissal came less than 24 hours after Chelsea suffered a humiliating 3-0 loss against Brighton on Tuesday.
Brighton thrash Chelsea 3-0 at the Amex Stadium to deal a blow to the Blues’ Champions League qualification hopes.
Ismaila Sarr put Crystal Palace ahead in the 41st minute.
Manchester City thrashed newcomers Burnley 5-1.
The 25-year-old will join the Reds in a deal worth an initial £125 million, potentially rising to £130 million with add-ons.
Daniel Ballard doubled the lead with a stunning strike before French international Wilson Isdoe sealed the victory, curling a superb effort into the far corner.
