England international Moeen Ali does not believe the hectic cricket schedule is sustainable.
Moeen, who has previously filled in as England's captain in T20Is and was named as vice-captain for the tour of West Indies earlier this year, retired from Test cricket in 2021.
The 35-year-old wanted to focus on the limited-overs formats, and more players seem to be faced with the decision of sacrificing one for the other.
In part, this has been put down to the tight and congested nature of the cricketing calendar, with tours scheduled between high-profile tournaments such as the Indian Premier League, the Big Bash League and, in England, The Hundred. There is also the small matter of another T20 World Cup coming up later this year in Australia.
England's new Test captain Ben Stokes has made a similar decision, giving up white-ball cricket to focus on the long format, while he skipped The Hundred alongside team-mate Jonny Bairstow this year.
"At the moment it's not sustainable," Moeen told reporters when asked about his concerns over the schedule.
Moeen also believes that 50-over matches are most vulnerable.
"Something has to be done because I fear losing the 50-over format in a couple of years because it's almost like the long, boring one," said the all-rounder, who is the captain of Birmingham Phoenix in The Hundred.
"There's no importance given to it at the moment.
"International cricket in all three formats is by far the best cricket to play, but I do worry there are so many tournaments out there that players are retiring more now, and you'll see more retiring soon, because of overlapping schedules."