Always baffles me how people think we can just throw unwanted players on clubs
How often do you see a swap deal? It's very rare.
For this to happen, Martial/Lingard would have to want to join Spurs, Spurs would have to want Martial/Lingard, and they'd have to come to an agreement on wages.
We don't need Spurs to take Lingard/Martial. We can sell them to raise funds, and the result is the same for us. Finding a buyer may be difficult for certain players, but it's more realistic than swapping our deadwood for whatever player we fancy and thinking everyone involved will just automatically agree to it.