Why left? You have Mane, Coutinho & Firmino who are all comfortable there plus Origi can be trained to make a decent left-side IF.
Get yourself a good right-sided IF. On my save Berardi has been an absolute monster. Did well (15+ goals) in S1 but his average personality meant he didn't develop super fast but by S2 he hit his stride and score 28 goals from RW.