Ryan Nelsen believes West Ham have issued a statement of intent by tying Winston Reid to a new deal.
Tottenham are keen for striker Shaquile Coulthirst to continue his development out on loan after his spell at Southend.
Brazilian Iriney, 32, who has spent time with Real Betis, Celta Vigo and Rayo Vallecano,joins for an undisclosed fee and pens a deal to keep him at the club until 2015.
Ekstrand's move is made permanent after the Swedish defender spent all of last season on loan with the Hornets, making 36 appearances in all competitions. He has signed a three-year deal at Vicarage Road.
Meanwhile, former Watford defender Carl Dickinson has joined Port Vale.