That’s just a classic KR excuse to deflect blame from himself when things go tits up, and you’ve lapped it up!
If he didn’t make up some bollox like that, then he’d have to admit his mistake in playing an unfit player a day after signing him, when he wasn’t ready, but we all know that would never happen!
And to answer your question of how are they supposed to get fit without playing in matches, well I would suggest giving them a good week in training first, then easing them into actual matches, which is what preseason is for, not throwing them straight into a game, before they’ve even unpacked their suitcase!
And apologies if I offended you with the first sentence of my post, I was being deliberately provocative, blame it on the heat!