Top target: Christopher Samba (left) is wanted by both Arsenal and Spurs
Arsenal face having to pay over the odds for Christopher Samba after it emerged that former club Hertha Berlin get 15 per cent of any fee for him.
Blackburn are reluctant to sell the centre back but seem certain to insist on at least £12million after agreeing to the clause when they signed him from Hertha for £450,000 in 2007.
Spurs have also expressed an interest in 27-year-old Samba.
Arsenal remain hopeful of finalising a £12m deal for Lille striker Gervinho this week and are chasing Southampton's Alex Oxlade-Chamberlain, 17.
Arsenal are awaiting a formal bid from Barcelona for Cesc Fabregas but the European champions have failed to sign any major targets yet.