The south Londoners were promoted back to the second tier after a two-year absence just 12 days ago, defeating Bradford City 1-0 in the League One play-off final.
The Lions’ most recent trip to The Hive came at the beginning of last season, when they overcame Barnet in the first round of the EFL Cup.
The fixture, which kicks off at 3pm, completes a trio of consecutive home warm-up games for Bees fans to enjoy in July.
Swansea City play at The Hive on Wednesday 12th July (7.45pm), with a West Ham United XI providing the opposition three days later (3pm).
Ticketing details for our pre-season programme will be announced in due course.