PSG leaves Mbappé off preseason tour amid contract dispute, puts star up for sale

PSG has excluded Mbappé from preseason tour to Asia due to refusal to extend contract beyond 2024.
Club believes Mbappé intends to join Real Madrid as free agent when contract expires.
PSG president gives Mbappé ultimatum to sign extension or be sold to avoid free transfer next year.
Mbappé willing to sit out upcoming season if not sold; insists on leaving PSG for Real Madrid.
Players' union in France criticizes PSG's treatment of Mbappé, threatens legal action for pressuring players.