By . Simon Jones . Blackburn have taken Carlos Cuellar on trial. The 32-year-old Spanish defender is on the lookout for a club after being released by Sunderland. Bargain: Spanish defender Carlos Cuellar is available on a free after his release from Sunderland . Villan: Cuellar spent four years at Villa Park after leaving Rangers in 2008 . Blackburn are also taking a look at former Leeds goalkeeper Jamie Ashdown, 33, and ex-West Ham defender Jordan Spence, 24. Meanwhile, Doncaster have signed Middlesbrough forward Curtis Main as part of the exchange deal for James Husband and former Arsenal full-back Cedric Evina.
Blackburn interest in signing free agent defender Carlos Cuellar . Spaniard was released by Sunderland earlier this summer .