The England international has joined up with a handful of his first-team team-mates as Arsene Wenger’s men begin their preparations for the 2015-16 Premier League campaign.
Oxlade-Chamberlain posted the picture above on his Instagram account on Tuesday afternoon and wrote: “Always good to get back to business.”
The 21-year-old midfielder scored three goals and made three assists in an injury hit campaign with the Gunners last season.
He was a late substitute as Arsenal thrashed Aston Villa 4-0 at Wembley to retain their FA Cup title.
Arsenal kick off their Premier League campaign with a home clash against West Ham United, the week after their Community Shield fixture against Chelsea at Wembley.
Meanwhile, Jack Wilshere was also clearly thrilled to be back in action at London Colney, as the England international shared the picture below and wrote: “❤️”
MORE: Man United latest news
MORE: Arsenal latest news
MORE: Chelsea latest news
MORE: Liverpool latest news