Colchester have completed the signing of defender Sean Clohessy from Scottish Premiership side Kilmarnock.
Southend manager Phil Brown has confirmed the club have offered new deals to four key players.
Sean Clohessy has warned Southend that they can forget about the play-offs if they fail to beat Torquay at the weekend.
Sean Clohessy has set his sights on automatic promotion next season after signing a new contract with Southend.
Southend United defender Sean Clohessy has signed a one-year contract extension at Roots Hall.
Southend have signed Sean Clohessy on a pre-contract, pending the lifting of their transfer embargo.
Gillingham have announced the release of seven players but are keen to keep Simon Royce and John Nutter.