Yes he has. Not our version of a LCM, but he's been on the left.
He's quite versatile- look at his favored foot for the position we've seen him play in. He's been very good playing on the left and in the center.
We've only seen him operate where his managers wanted him to, but I'm sure he can operate right across midfield, given his versatility.
His last 50 matches, he apparently played 22 as a DM, and 16 as a CAM. Not sure if this is just for Brighton or just Argentina, or both.