He´s a good center back. Last game he played left back, because of Real Sociedad´s injuries in the left side of the defense. He did make some crosses and end up with an assist (low smart cross). He´s not the best at positioning and decision making but he is decent. I have some trouble seeing him against Morata, Lukaku, Kane and Lacazette because he´s a bit impulsive and ends up making some mistakes, when attacking the ball or controlling the space behind.
But Pep knows better.
Has a third option make sense, but if we want to buy for the future, there´s better options.
We should wait until summer and bring Skriniar.