The 23-year-old defensive midfielder joined West Ham on deadline day on a loan deal with an obligation to buy if certain conditions are met.
The Hammers have been tracking Kral all summer, but it took them until the final hours of the window to get the deal over the line.
And it has been claimed that it was the performances of a certain young player during pre-season that made Moyes dither for a while over signing Kral.
Coventry, 21, caught the eye of many with his showings in West Ham colours during pre-season.
There were murmurs that he could be made part of the first-team squad this season and an approach for a permanent deal from Peterborough United was rejected earlier in the window.
But ultimately Moyes decided that playing regular football this season would serve Coventry better and he was loaned out to Peterborough.
Kral has been signed as another option in the middle of the park for West Ham as they look to take on the challenge of playing in Europe.
He is likely to get his initial opportunities in cup games and the Europa League if Moyes decides to rotate his squad.
