Chelsea have signed former Arsenal striker Pierre-Emerick Aubameyang from Barcelona, with Marcos Alonso set to go the other way after his Blues contract was terminated.

Chelsea are understood to be paying in the region of £10m plus Alonso for the former Arsenal striker.

Aubameyang flew to the UK on Thursday afternoon for his medical and to finalise the deal, which was completed after the 11pm deadline after Chelsea filed the deal sheet to allow more time.

Aubameyang suffered a minor fracture of his jaw in an attack on his home over the weekend. The Gabon forward, who is expected to be out of action for three weeks, can resume non-contact training next week.

Aubameyang moved to Barcelona on a free transfer from Arsenal in January. Although Thomas Tuchel had been reluctant to talk about Aubameyang in public he was keen to work again with a player who scored 79 goals for him in two seasons at Borussia Dortmund.

Meanwhile, Alonso has left Chelsea by mutual consent; He won six trophies in his six years with the club, including the Premier League and Champions League.

Aubameyang's signing means Chelsea have spent a huge £278.4m in the summer transfer window, including the arrivals of Wesley Fofana, Marc Cucurella, Raheem Sterling and Kalidou Koulibaly. It is the most any club has spent in a single transfer window