Sterling was never established as a left winger though, he was playing across the front 3 and CAM his whole career because nobody ever found his best position. Mahrez is similar to Messi, a left footed winger who likes to come in and can also play CAM. It doesn't matter what Pep wants from Mahrez, he's not the pacy classical winger Sane can play for us, he's more similar to Bernardo than Sane, and we don't need another playmaker.
Would rather Zinchenko, Diaz, Nmecha, heck even Danilo could play LW or we go 3-5-2 with Laporte. If we want a Leicester play, Gray is better value for money as a LW.