I said it in the chat and I'll say it again: if used properly I think he could be a very valuable sub. In a handful of tough games this season, Lucho has opted to make a late sub of taking off a defender and subbing in Arda to double up on the left flank with Neymar (as if Neymar himself doesn't provide enough width
). Yet our right flank remains crippingly weak since Messi doesn't actually play as a right winger.
Having Vidal there with his pace/energy could be exactly what we need in a deadly super-sub to stretch the opponents wide and give space. He's also very skillful with cutbacks instead of crosses and increase our dynamic attacking options. It seems to be a common-sense sub but we haven't even utilized it once.