Zak can win matches for England even though he hasn't scored a half century in 14 Tests.
In the first Test against South Africa at Lord's, Crawley scored nine and 13 runs.
"He's a talent, and there aren't a lot of those guys floating around," said the man. At this level, he's still learning. patience and persistence will be required to get that done.
I believe in him.
After making his debut against New Zealand, Kent's Crawley averages 26 in his 26 Tests.
He made a score of 267 against Pakistan in 2020, which is the 10th highest individual score by an England man in a Test.
His 121 against West Indies was the last time he scored more than 46. The 24 year old has only passed 50 seven times.
"You have to think about the whole package," he said. Some players have been put in those positions because of their skills.
Zak is not a consistent cricketer because of his skill set. He isn't that kind of player.
When he gets going, he can win matches for England.
The second Test between South Africa and the UK is set to start on Thursday.
He did not believe that Crawley would benefit from being left out.
He said that was not how he thought. We want to give guys opportunities so they can develop their skills.
To keep giving guys opportunities, we have to be really positive around the language we use with him.
Selection loyalty is crucial. It also builds loyalty from guys on the outside because they know they will get the same loyalty when their chance comes.
The Lord's defeat was the first time that McCullum had been as coach.
A feature of England's successful start to the summer was some aggressive performances with the bat, but the home side were defeated by a powerful South Africa bowling attack.
He thinks his side could have done more.
He said that one of the messages would be, "did we go hard enough?" Is it possible that we went a bit harder and turned some pressure back on the opposition?
When some of the spells from their boys were testing, we could have been a little braver.