West Ham flew off to Romania on Wednesday morning to face Romanian side Astra Giurgiu in the Europa League play-off round.
The Hammers were beaten by Astra in the third qualifying round last season and will be hoping to exert revenge on the Romanian club this time.
Jonathan Calleri, who completed his season-long loan move from Deportivo Maldonado on August 11, was aboard the flight.
Goalkeeper Adrian posted an Instagram photo of some of the players looking in good spirits aboard the plane.