After they splashed out a club-record £30m fee to sign Habib Diarra, some may have expected Sunderland to slow their spending down. That's far from the case, however, as new Director of Football Florent Ghisolfi and Kristjaan Speakman kick things up a notch.

Noah Sadiki: Sunderland a "huge club"

Since signing Diarra, Sunderland have also welcomed Noah Sadiki from Union Saint-Gilloise to beat Leeds United to yet another transfer target this summer. The central midfielder arrives for around £17.5m, taking the Black Cats' summer spending to around the £50m-mark in what has been a statement-making window thus far.

After putting pen to paper, the midfielder told Sunderland's official website: “I want to thank everyone for welcoming me to Sunderland. This is a huge Club, but what convinced me was speaking to the people.

"They spoke about the history, what they want to build, and their belief in the part that I can play. I will bring duels, forward runs, passion, and track back. Above all else, I want to win – and I carry this desire with me every time I step onto the field. This is my team now, and I’m really happy with my decision.”

In the middle of a busy but impressive summer, sporting director Speakman also shared his delight after welcoming Sadiki: “Noah’s enjoyed a great level of experience at a relatively young age, and alongside his drive to improve, this makes him an exciting addition to our squad."

Speakman and Ghisolfi aren't done just yet, however. Even after splashing out around £50m, they look destined to spend £20m more to welcome an attacking reinforcement in a deal out of nowhere.

Sunderland agree quick-fire deal to sign Chemsdine Talbi

According to Fabrizio Romano, Sunderland have now reached an agreement to sign Chemsdine Talbi from Club Brugge and are expected to announce the arrival of the winger for €23m (£20m) plus add-ons. In another statement of intent from the Black Cats, the 20-year-old represents someone who is only set to get better with experience.

Dubbed "electric" by U23 scout Antonio Mango last season, Regis Le Bris will be signing a player who could instantly become one of the quickest to grace the Premier League - having clocked a faster time than Micky van de Ven last season.

On top of that, the winger possesses an eye for goal after netting seven in all competitions last time out and already has Champions League experience to his name. Out of Diarra, Le Fee and Sadiki, it could be Talbi who stands out as Sunderland's signing of the summer.