If there are players in the squad that Jose feels aren't giving 100% in training/rehabilitation/on-field performances, he won't hesitate to call them out on it. That's what he's there to do, to be the boss. Fergie wouldn't have tolerated it and neither would Van Gaal (probably). Moyes might have tolerated it, but he's a shit manager.
If we're going to get back to where we want to be, we need everyone ready and willing to really push and fight for their places, week in, week out. We can't indulge stragglers or coasters. We need to send out the message that we can and will pay big money in wages - but that no small measure of skill, hard work and commitment is expected in return.