I'm still bemused by people wondering if Sané & Mendy can play together.
Loads of world class wingers have had rampaging fullbacks behind them which they've formed partnerships with. Sané has played loads of games on the right in Germany (in fact the season before he joined he almost exclusively played on the right) if Pep wants inverted wingers. One of the main features of Mendy's last 2 games has been his running inside, off his wing as in the build up to Jesus' goal on Sunday.
Why wouldn't they work together?