No one with the money to cover their wages, that is. Dier has bags of experience, Reguilon can do a job as an attacking full back (Aurier found a club, after all), Rodon used to be fairly highly rated and he hardly played a game for us (don't know how his loan went), Tanganga played for AC Milan, which could be seen as an accomplishment by an average Championship side... problem is, they're all on high wages and since nobody at the club made it clear that would never, ever play for Spurs again, they feel they're better off waiting for a chance to get back in the first team rather than taking a wage cut in a lower mid-table team.
For me, the most important thing to succeed as a professional football player is the unshakable belief that you're the best. Some players I've met were completely delusional about themselves but no matter what, they always thought they'd make it to the top at the end of the day. All setbacks were because of the manager, the fans, team mates, whatever. When you think that way, you always think there's a way back for you. That's why it's usually better to talk directly to their agents.