Jonny Bairstow will be back in England's Test team sooner than later, according to Alastair Cook.
The Yorkshire batsman was dropped for the two-Test series against New Zealand, which begins later this month, after a poor run of form with the bat.
Bairstow has since been called up as cover for Joe Denly, who twisted his right ankle last week, and Cook believes he will grasp the opportunity to prove himself again.
Alastair Cook has backed wicketkeeper Jonny Bairstow to rediscover his form in Test cricket
Cook believes that Bairstow will be eager to take his chance to prove someone wrong
'He's going through one of those periods which you do as a player. Some stuff sneaks into your game, into your technique after playing so much cricket, which you don't like', he told Sportsmail.
'I know Jonny pretty well, every time there's a chance to prove someone wrong, like his hundred in Sri Lanka, he'll be on it.
'It's a good time for him to work on his game. Everyone can see when you get bowled as many times as he has been, it's obvious there's not something quite right there.
'He knows that, he's an experienced and very good cricketer. He'll be working as hard as anyone to do it. These are the little stages you get in your career, it's not all plain sailing.
'One moment you're winning the World Cup and six months down the line it is tougher. It's how you deal with that and how you bounce back.'
Bairstow's decline in the red ball game has been alarming, he has gone from averaging 59 in 2016 to just 20 this year, and has been bowled 15 times in his last 39 innings.
Bairstow was initially dropped or the two-match Test series against New Zealand
He has since been recalled with England sweating over the fitness of Joe Denly
Cook says Bairstow has struggled with the 'incredibly difficult' transition from white ball game
Cook believes it is a technical flaw that has crept into his game from his success as a one-day opener, a transition he concedes is 'incredibly hard'.
'Bowlers become more aware of it', he insists. 'In the one dayers, going out at the top of the order, he stands a little leg side to free up the off side. It's been very successful for him in his one-day career. It just sneaks in a little bit to his Test game. '
'He'll be aware of it a lot more. When you get a clean break you're back to working on it. I have no doubt Jonny Bairstow will be back.
The series in New Zealand will be Chris Silverwood's first since taking over the reins from Trevor Bayliss. Cook worked under the former fast bowler when he was in charge of Essex and led them to the County Championship title in 2017.
He believes his hands-on approach will help get the best out of Joe Root's captaincy.
'I think Joe is definitely the right man to lead England forward. From my experience of it it took me two or three years to really feel comfortable in that role', he says.
'We're getting to that stage with Rooty now, I think Silverwood will be good for him.
'He'll take a lot of the off-field stuff away from him, working with