Opening batsman Cook quit yesterday after a record 59 matches as England's Test captain, saying in an England and Wales Cricket Board statement it had been an "incredibly hard" but "correct" decision.
He added he hoped to "carry on as a Test player".
Cook, England's leading scorer in Tests with 11,057 runs, succeeded Strauss as captain in August 2012.
By then Strauss had exited the international stage, having lost form in a series defeat by South Africa which was overshadowed by an off-the-field row involving star batsman Kevin Pietersen -- finally axed by England in 2014 after a team led by Cook suffered a 5-0 Ashes thrashing in Australia.
"I think he's dealt with the twin challenges of captaincy and performing well -- myself and others have struggled," Strauss told reporters at Lord's on Monday.
"Without the travails of the captaincy I believe it will freshen him up immensely. He's only 32 years of age, he's potentially got three or four years at least, to concentrate on his game and be unshackled."
Cook led his country to Ashes glory on home soil in 2013 and 2015 as well as series wins in India and South Africa.
Strauss knew the Essex left-hander was close to resigning when he met with him in January.
- Cook's decision -
===================
Strauss added he had not tried to get Cook to change his mind when his former team-mate next got in touch with him during the past 10 days.
"We never got to that stage. If a captain is questioning how much he has left in the tank then he is making that decision himself."
Strauss insisted Cook would be regarded as one of "England's great captains", saying he deserved particular credit for the 2015 Ashes success.
"For him to have fashioned a team environment as quickly as he did on the back of everything that had gone on, speaks volumes for him and he was never happier than when the team was doing well.
"He was certainly never in it for personal glory."
Key batsman Joe Root, the current Test vice-captain, is the overwhelming favourite to succeed Cook as skipper.
But England's next Test is not until July 6, against South Africa at Lord's, with their focus on one-day cricket as they prepare for June's Champions Trophy tournament on home soil.
But Strauss, who made it clear he wanted Eoin Morgan to continue as England's 'white-ball' captain, said: "Whoever takes over the Test captaincy, will benefit from a period where they can concentrate on themselves as a player.
"It's worth saying Joe Root has done a very good job as vice-captain, he's matured a lot over the last two years and there is absolutely no reason he won't be one of the strong candidates."
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