Reading pair Sean Morrison and Jordan Obita have both signed new contracts at the Madejski Stadium.
Ipswich defender Aaron Cresswell has signed a two-year extension to his contract.
Liverpool have reportedly agreed in principal to sign Valencia defender Aly Cissokho on loan with a view to permanent deal.
Manager Brendan Rodgers has been looking for reinforcements at left-back as Jose Enrique is his only senior player in that position and has identified the Frenchman as a viable option.
Cissokho is expected to travel to Merseyside in the next week to undergo a medical and agree personal terms, although it is understood Liverpool do not believe that will be an issue.
An agreement is in place for the club to sign Cissokho permanently should his season-long stay be successful.