Spanish boss held farewell press conference after confirming his departure from Athletic Bilbao.
Sanchez, 28, is reportedly Bayern's priority summer transfer target.
Shkodran Mustafi doubtful for Wembley showcase but Alex Oxlade-Chamberlain returns.
Valverde helped Bilbao win the Spanish Super Cup in 2015 after defeating Barcelona.
Ligue 1 outfit have reportedly made French striker their number one transfer target for the window ahead.
France international sees three-game ban for red card against Everton upheld.
Mbappe scored 15 goals in 29 league appearances for Monaco this season.
Spanish international is said to be the Catalans' alternative to Arsenal's Hector Bellerin for the right-back.
Onyekuru is the joint top-scorer in the Belgian top-flight with 22 goals in 38 games.
Sanchez, Shkodran Mustafi and Gibbs are also expected to be fit for Wembley clash.
Kroenke Sports & Entertainment say they will remain a "committed, long-term investor" in the club.
Wenger, 67, is under pressure to resign after a disappointing season.
Simeone, 47, led Atletico to a third-place finish in La Liga this season.
IBTimes UK's sports writers have their say on who produced the best strike this season.
Arsene Wenger's future at Arsenal remains uncertain with the French coach yet to agree an extension.
Ronald Koeman confirmed the intentions of the Toffees following the 3-1 defeat at Arsenal.
Brazil centre-back suffered a knee injury during the 3-1 victory over Everton on 21 May.
Gunners shoot down Toffees but fail to sneak into top four.
The 22-year-old will represent his country at the Under-21 Euros in Poland in June.
Usmanov and Kroenke hold 30% and 67% stake, respectively at Arsenal.
Szczesny says it was the right decision to leave Arsenal and join AS Roma on loan in 2015.
The Germany international left Wolfsburg to join the French giants in January.