No way man. Roberto + Lenglet on the same side? Are you kidding? That's a chain reaction of shit that would blow up Camp Nou and kill everyone. The better natural defender is more likely to cut it on a new position.
I think he's having mental/confidence issues... He was never a world beater but he was always a correct and intelligent player, but right now he looks like a complete amateur out there...
He's a good league RB but in the CL he's not good enough to be a starting RB for a top team.
We see it time and time again, he can put up some good stats in the league but look way out of his depth in the CL. A bad system plays apart but for Roberto, he just isn't any more than a rotational player at best and it should stay that way.
Out of Valverde's untouchable past-it players (Saurez, Busi, Roberto, Alba and Pique), Suarez, Alba and Pique still have their moments but Busi and Roberto are just absolutely useless.