The Arsenal boss spoke about his new signing saying:

“Mikel is a player who will bring us huge quality with his experience and versatility. He has played at the top of the game at both club and international level for a number of seasons now.

“Mikel will make our squad significantly stronger, with his technical ability, together with his strong and positive character and personality.

“As we all saw in the summer, Mikel is also a winner, with his strong performances throughout the Euros helping Spain win the tournament. We are delighted to welcome Mikel and his family to the club and can’t wait to start working with him.”

The Colombian, winner of the 2014 World Cup golden boot and this year’s ‘best player’ award at the Copa America, was a free agent after terminating his contract with Sao Paulo.

He joins the La Liga side on a one-year contract, with an option for an additional year.

Arsenal have completed the signing of Spain international Mikel Merino from Real Sociedad.

The tow clubs have agreed a fee of £31.64m (split between £27.42m + £4.22m in add ons). The midfielder has signed a four-year deal at the Emirates, with the option for a further 12 months.

Merino becomes Arsenal’s fourth signing of the summer, following the arrivals of Tommy Setford and Riccardo Calafiori, as well as the permanent acquisition of David Raya.

Fabrizio Romano reports that Forest are now focusing more on Santiago Gimenez of Feyenoord as their striker signing. Forest’s latest proposal was for a fee of €33m with add-ons, making it a club record sale for Feyenoord.

Romano added that Gimenez is “open to the move”, but it is “now up to the clubs again” to iron out the terms of a deal.

More recently, Ben Jacobs reports that “Forest are close to a £30m agreement with Feyenoord” for the Mexican striker.

Fabrizio Romano says that Manuel Ugarte and his team have approved the personal terms for his potential move to Manchester United this summer.

The midfielder will be signed to a five-year contract with an option for further year. Paris Saint-Germain will have a sell-on clause included in package worth €35m plus €10m add-ons.

Plenty still going on at West Ham ahead of the window closing on Friday.

The London club are still chasing PSG midfielder Carlos Soler, with talks ongoing between the clubs, and reports are also linking them with former Chelsea striker Tammy Abraham, who is currently at Roma.

Several players could leave the Hammers too, with James War-Prowse, Maxwel Cornet and Nayef Aguerd all up for sale. Defender Kurt Zouma has seen a move to UAE club Shabab Al-Ahly fall through, though there is interest from Saudi in the Frenchman, report Sky.

Ilkay Gundogan was the creator who became captain. Now he is the confidant who could become a coach. Pep Guardiola rarely re-signs players but he broke a personal rule to be reunited with the German. They are the neighbours who may be found side by side in a dugout in the future.

Gundogan was Guardiola’s first signing for Manchester City; should the manager leave when his contract expires next summer, he may prove his last, as well. But even then, their alliance could be renewed. They were separated for a year when Gundogan joined Barcelona. Perhaps it gave Guardiola a mole in the Catalan camp. Certainly each had a sounding board. And it meant that, when Gundogan mooted the idea of the summer’s most sensational comeback, he was confident of the answer.

“We were in touch throughout last year,” Gundogan said. “We had more than a couple of phone calls. I went to his childhood club and he’s still a big fan of FC Barcelona, he doesn’t make a secret out of it because he’s from there and it’s the club he loves.

“And when I put it out there, the idea, he loved it, and he said, ‘let’s try to do it’. From there, everything happened very quickly.”

Napoli’s Victor Osimhen has long been a rumoured target for Chelsea, who have agreed a deal to sell Romelu Lukaku to the Italian club.

And it has been expected that, following the completion of that deal, Chelsea would swoop for the Nigerian striker.

However, Sky Sports reports that “interest remains from an Saudi Arabian club Al Ahli for Victor Osimhen, who are pushing hard to sign the Napoli striker”.

In addition, “it is likely that a club-to-club agreement can be reached on more satisfactory terms than Chelsea and PSG”.

Nevertheless, the report adds that for Al Ahli, “it might be more difficult to reach an agreement with Osimhen” himself.

“Interested clubs are thought to holding on until the final few days as they sense Napoli may get desperate to sell,” adds Sky.

The Mirror are also reporting that Pep Guardiola is ready to give the green light to the departure of midfielder Matheus Nunes.

The Portuguese made just 17 appearances in his debut season since a £53m move, and Chelsea, Liverpool and Newcastle are all reportedly interested in the former Wolves man.

With the return of Ilkay Gundogan, the Portugal man has fallen “even further down the pecking order” at City.

This would be one of the stories of the window if this came true.

The Daily Telegraph reports that Chelsea are interested in a swap deal with Manchester United for Jadon Sancho and Raheem Sterling.

Several outlets have reported that Chelsea are considering the move for the out-of-favour United winger, and they are also supposedly hoping that United might be interested in their own out-of-favour winger, Raheem Sterling.

The Telegraph adds that Juventus are the other club interested in Sancho, and “at present, the Serie A club looks a more likely destination”.

United would reportedly want around £40m for the England international, “ but a loan with an obligation to buy appears to be the most likely offer at this stage”.

Any deal is further complicated by his wage demands, as “ it is unlikely that any club would want to cover Sancho’s wages in full, which United will try and insist on.