Vorm, Davies, Wimmer, Wanyama, Chadli, Son and Janssen would make for a very good bench if all were on form.
There's also Trippier, Mason (albeit not for much longer) Carroll (as PNP says though, in the three but not the two) plus young stars like Onomah (who needs to play more central and not right wing), CCV, KWP, Edwards and Harrison.
Unfortunately one of that strong bench appears to definitely be off (Chadli) while another is being linked with a return to Germany (Son). The likely arrival of GNK for Clint will see us have a much needed speedy wing option and so it still leaves us a squad place short of a quality bench if both Nacer and Son leave. It's why I want to believe in the Isco rumours, so that it'll mean at any given game, one of Alli, Eriksen, Lamela and Isco will have to make do with a place on the bench, that would result in having immense quality to bring on, all would get an abundance of game time because you can easily rotate a different player out for every single game. It'd also create a massive statement from the club, after City, Utd & Pool's big spending, Arsenal's impending duo deal and Chelsea looking strong again, it'll remind them all that Spurs are still here and ready to fight.