The Leeds United owner has returned home to continue the White's manager search.
Liverpool completed a move for Mainz goalkeeper Loris Karius this week.
Arsenal finished second in the Premier League this past season.
Arsenal have been linked with Napoli defender Kalidou Koulibaly.
Stoke City have been linked with Axel Witsel.
Nolberto Solano believes the Spanish boss' decision to remain at St. James' Park is as seminal a moment as Robson's appointment in 1999.
Liverpool are reportedly keen to land West Ham ace Reece Oxford.
The Forest player was showing off the club's new kit.
The Belgian attacker ended the season with four goals in Chelsea's last five matches to suggest he is over his previous dismal run of form.
Barton headed to Glasgow and Rangers to work under Mark Warburton at Ibrox.