The 24-year-old forward joined the Potters on a four-year contract, signing from Werder Bremen for £2m.
"Marko is very adept at playing across the front line, he gives us that flexibility," Hughes told reporters. "He can play both wings, and in his own mind that is where he thinks he's more accomplished, but only because he's played more games there.
"But I've no doubt he can play in any number of positions and in different combinations with the players we've got here. In that regard, I think he's a very good acquisition."
Arnautovic made 83 appearances for Werder Bremen, scoring 16 goals in the process.