Sky Sports understands Watford have agreed deals to sign Manuel Almunia and Fitz Hall.
Goalkeeper Almunia and central defender Hall will arrive at Vicarage Road on free transfers after leaving Arsenal and Queens Park Rangers, respectively, this summer.
Almunia was released by the Gunners after finding himself well down the pecking order at Emirates Stadium, while Hall was allowed to leave Loftus Road after seeing out his contract.
A number of other clubs were thought to be chasing the free agents, but Watford have won the race for their signatures.
Almunia will help fill the void left by Scott Loach's departure to Ipswich, while Hall will provide cover in defence following Adrian Mariappa's move to Reading.