Both sides don't want to let their rival dominate. And the competition may yet be transformed further.
The US president has threatened to take out Iran "in one night" if it does not agree to open the Strait of Hormuz.
Viktor Gyokeres' impact at Sporting will never be forgotten, but he returns on Tuesday hoping to help fire Arsenal into the Champions League semi-finals.
BBC Sport travels with the UK's ultimate groundhopper to the final match of a decades-long, history-making journey.
Tui is investigating the claims and says it is "not in a position to provide a statement at this stage".