Sir Antonio Horta-Osorio, the former Lloyds chief and Credit Suisse chairman, attended the "super-spreader" European Championship football final last summer when he should have been in quarantine, it has emerged.
The banker stood down from the Swiss bank this week following an investigation that found he broke quarantine regulations last summer when visiting London to watch the Wimbledon final.
It has now emerged that Sir Antonio went from the tennis in Wimbledon to the football in Wembley on the same day.
More than 5,000 people caught Covid at the Euros final and semi-finals last summer, with health officials saying the "super-spreader" events showed how quickly the virus could spread.
Those close to Sir Antonio said the football was a client event but a number of invited guests dropped out at short notice and so he took his children instead. One client still attended with his wife and her parents, sources said.
His attendance at the game, first reported by the Financial Times, has emerged days after he quit Credit Suisse just eight months after he vowed to stabilise the scandal-hit bank and overhaul its culture.
Sir Antonio said when resigning from the Swiss bank: "I regret that a number of my personal actions have led to difficulties for the bank and compromised my ability to represent the bank internally and externally. I therefore believe my resignation is in the interest of the bank and its stakeholders at this time."
He is now splitting his time between Lisbon and London, sources said.
His exit came after the bank investigated at least two separate Covid violations, including his July trip to Wimbledon, as well as his use of the company private jet after he was taken to the Maldives after a work event in Asia to see his family.
An internal audit concluded no irregularities on his use of the company jet, sources said, as the plane had to stop to refuel regardless.
Sir Antonio, who restored Lloyds after the 2008 financial crisis, is understood to have pleaded his case during meetings about his future last weekend. However, insiders said the breaches meant he “lost moral authority” during a time when he was trying to reform the lender’s culture.
When he joined Credit Suisse last April, it was fighting to restore its reputation following a major spying scandal as well as the twin implosions of two of its clients Greensill Capital and Archegos.
Sir Antonio is a tennis fan, learning to play the game left-handed after breaking his wrist so badly on the court on his 30th birthday that doctors said he would never play again.
The father of three eventually restarted on his right-hand too.
A spokesman for Sir Antonio declined to comment.