no you can't.
Not the right thread, but why not? I'm not an economist, but any player has a value made of his market value, earnings and length of contract. Substituting a top earner with a new player can save 15m in wages plus whatever resale value he may have. You can apply that toward purchasing another player. What is not for the club is to lose a high earner on a free, as just playing in the CL groups stages is worth more than 15m.
Of course, the player has a say in that too. If any of them is willing to run his contract down, there's nothing the club can do. I think it was bad dealings letting VVD, Salah and Trent get to that stage, but we had on DoF for less than a year, than one on a temporary basis... The club was a bit of a mess. I hope that gets sorted, but now there is no denying that the said players have the upper hand.