RB Leipzig, Real Sociedad, and Roma were reportedly interested in signing Guiu on loan, but Sunderland won the deal. According to transfer expert Fabrizio Romano, the loan agreement is straightforward, with no option for Sunderland to buy Guiu permanently. Guiu remains part of Chelsea's long-term plans.

Sunderland will cover Guiu's salary, and he will be an important striker for manager Regis Le Bris's team. Chelsea has made other signings this summer, including Joao Pedro, Liam Delap, and Jamie Gittens, and is expected to sign Xavi Simons from RB Leipzig.

Sunderland has made significant signings this summer, including Granit Xhaka, Habib Diarra, Simon Adingra, Enzo Le Fee, and Chemsdine Talbi. These players will serve under manager Regis Le Bris, who aims to keep the team away from relegation.