Millwall winger James Henry will miss a chunk of pre-season after suffering a knee injury.
Henry was hurt during Monday night's 0-0 friendly draw against Shelbourne in Dublin and faces a couple of weeks on the sidelines.
Better news for manager Kenny Jackett was the return of midfielder Therry Racon, who missed almost all of last season with an ankle injury.
"James has twisted knee ligaments and may be out of action for up to a fortnight," said Jackett.
"Therry came through his first 45 minutes in a Millwall shirt in a year and came through okay."