Nick Tandy says the shock of Porsche's factory GTLM IMSA programme is worse than finding out he would not be able to defend his Le Mans 24 Hours victory.
Porsche has announced that it will not continue its IMSA programme, which began in 2014, at the end of the 2020 season.
Tandy has been part of the CORE Autosport-run campaign since the beginning and has scored numerous successes, including helping the team scoop all the major GTLM titles in 2015.
That was also the year Tandy won Le Mans outright, sharing the 'third' LMP1 Porsche 919 Hybrid with Nico Hulkenberg and Earl Bamber. Due to the fallout of 'dieselgate', he was not able to return to contest overall victory in 2016.
"I feel more gutted about losing the IMSA programme than when I found out I wasn't going to defend my Le Mans win," said Tandy.
"I've been part of it since the beginning and it's always been my dream to race in IMSA and the United States.
"It's the worst day of my motorsport career. And it's not just me, it's lots of people."
Tandy confirmed that the news was a surprise for the motorsport operation but hopes Porsche will continue with some competition programmes.
"I found out yesterday [Wednesday] and I think a lot of key people involved did," added Tandy. "It's a huge shock to everyone.
"I'm sure Porsche will always be involved in sportscar racing and motorsport in general, but we just don't know what the short-term plan is."