Manchester should release Anthony to Leverkusen so they can generate money off the deal, there's no need keeping him when they can't featur him properly or use him in the right way, and beside Manchester united needs some money to pay the wages and salary of this player, and run the club well fare.
Manchester United do not look like a team that is constrained financially so they may not be in a hurry to release Antony not for financial reasons. Manchester United is a very wealthy team and can actually afford to take care of wages and all of that, they have not made it known if they had problem with all of that to the point they will want to sell of some of their players to be able to get that done.the sales of Antony will not be for reasons of them jn dare need of funds but because either he wants to move or the team may no longer want him with them anymore.