Blues will play host to a strong Addicks team on Tuesday 28th July.
Southend United can announce the first confirmed pre-season friendly, when Charlton Athletic visit Roots Hall on Tuesday 28th July, kick-off 7.45pm.
The Addicks – who finished in mid-table in the Sky Bet Championship last season - are expected to bring a strong squad to Essex for the game, in what should be a useful workout for both teams.
Also expected to be in the Athletic side is former Blues loanee and Wembley hero Joe Pigott.
Ticket details for the game will be announced nearer the time.