First I'd sell McCarthy to a local livestock dealer, for about £6 per kilo.
Then I'd take the squad out to the Brecon Beacons for a team-building experience with the SAS. A little escape and evasion exercise, followed by some strenuous torture after the inevitable capture caused by most of them refusing to run. Hopefully Schneiderlin would "get lost" during the night and be found, six days later, frozen solid at the bottom of a ravine.
More seriously, maybe taking them to somewhere worlds away from their pampered bubble would be an idea? Spend a week in Soweto living in a tin shack, thirteen people to a room, living on porridge and walking seven miles each way to get some tepid dirty water JUST to make them realise how amazingly easy they have it in comparison. Then bring them back to Finch Farm and set some new ground rules for the rest of the season - all based on discipline, effort and commitment.
At the end of the season, sell / give away Sandro, McCarthy, Schneiderlin, Bolasie, Tosun, Niasse, Walcott and soooooooo many others.
The lack of effort and fight in most of our players right now absolutely boils my urine.