Juve set to sign Lulic! Why?

                  

The Bianconeri have been linked with a move for the 28-year-old Bosnian over the past few months and recent weeks have only seen that speculation increase.
            Bosnian website Sport.ba are running the line, though, that a simpler cash deal of €15m for the full-back has now been agreed and that the player will even be in Turin on Monday to undergo medical tests before committing to a four-year contract paying €2m a season.
            The Gazzetta dello Sport, however, report that Lulic’s subsequently expected delay in joining up with the rest of his international teammates for their World Cup training preparations sits in contrast with Coach Safet Susic’s request to actually have the Serie A-based members of his squad released early.
            The pink paper also reiterates its belief that Lazio and Juve are still in talks over a possible cash-plus-player deal, with the Aquile showing interest in four of the Old Lady’s stock - Fabio Quagliarella, Mauricio Isla, Angelo Ogbonna and Sebastian Giovinco.

            I think €15m for Lulic is way too much, Lichsteiner was €12m. Maybe with some swap + money.
But by me, I don't even know why we would buy Lulic. He is something between left back and left winger, which is a player for our current 3-5-2 formation and Conte for two years is talking that he don't have players for other formation. So why do we need Lulic?