Sane and Sterling are hardly similar. But both possess tremendous speed. We can find another player with varying degrees of other qualities, but one who has that underlying similarity of immense pace.The old conundrum when building a squad, do you want replacements or alternatives? I think if your coach is as great as Pep, and players are good enough to adapt, then you want as much quality and variety as possible, rather than for example Sane, and a less good version of Sane on the bench.
If it were up to me, that third player will be Gelson Martin's. He is the kind of raw talent on the outside that can become unplayable under Pep.
We are at our best with 2 wingers flying at you off of deadly passes from the exquisite Quartet of Silva, Silva, Ilkay and Kevin