Dybala hasn't signed his contract with Roma yet. In fact, his entourage and the Roma directors are still settling the final details of the deal for the player's salary. As a consequence, Dybala won't travel with the rest of the squad for the friendly against Sporting Lisbon tonight.
The official annoucement has not arrived yet. If the final details are settled during the course of the evening, then Dybala will join his new teammates at the stadium in Faro, where the friendly will be played.