England’s all-time leading run-scorer and their most-capped player said Joe Root’s team should not play more than 10 Tests a year.
Earlier this year England toured the West Indies playing three Tests, then took on Australia in a five-Test Ashes series.
Next month they are playing two Tests against New Zealand and then over Christmas begin a four-Test series in South Africa.
Cook, who retired from international cricket last summer, said that in his view English cricket could not sustain a fourth format of the game with the introduction of The Hundred next summer running alongside first class county cricket, one-day cricket and Twenty20.
“I think we play too much cricket and I think the way of protecting Test cricket is to play slightly less of it and make it more unique by having four or five test matches at home and four away, so there are only 10 test matches a year,” Cook said.
“So, it is more of an occasion, so you can allow the Twenty20 leagues to go on and The Hundred and the best players can still play Test cricket.
Hales lost his place in last year’s World Cup-winning squad after news of a second failed test for recreational drugs.
The Warwickshire all-rounder is one on 18 bowlers to be selected for personalised practice.
The West Indies are due to arrive on these shores first this summer.
Broad took part in an individual training session at Trent Bridge.
Clare Connor suggested England are considering hosting a Women’s Tri-Series also involving India and South Africa.
The designated bowlers, whose identitites have not been confirmed, will have their temperatures checked.
The ECB had planned to introduce 40 professional contracts this summer across eight regional hubs.
County are waiting on a decision.
The Somerset bowler last month opened up about his mental health struggles and he discussed the topic further with Marcus Trescothick on Zoom.