Arsenal midfielder Kelechi Nwakali will spend next season on loan at Porto.
Nigerian-born Nwakali, 20, joined the Gunners during the summer of 2016.
Speaking to the Porto official website, he said: "My main goal is to develop, improve my qualities and the other aspects I know I need to correct to grow in the way I play," said Nwakali."
Arsenal are also reported to be on the verge of finalising a deal for 16-year-old left-back Joel Lopez from Barcelona.
Gunners head coach Unai Emery is set to take his squad on a pre-season tour of Singapore.
Arsenal fly out on July 22 and will face Europa League holders Atletico Madrid as well as Emery's former club Paris St-Germain as part of the International Champions Cup.