Tony Mowbray's managed a team against Millwall on 11 occasions and has come up on top against The Lions in five of those bouts.
But there's no doubting that every single one of those victories has been hard fought, against a side who have always been known for their toughness.
Aside from The Lions' battling qualities, Mowbray admits that they do have players who are technical and capable of hurting Rovers this weekend.
“Millwall have already been to West Brom and got a 1-1 draw, they’ve gone to Middlesbrough and got a 1-1 draw, they’ve beaten Preston, beaten Sheffield Wednesday," Mowbray told iFollow Rovers.
“They’ve only lost to Fulham and are a decent team. Normally, you play against some teams and the fans say ‘we should be beating them’.
“But it’s not the reality, because it’s 11 v 11 and you have to find a way to beat them. They have a work ethic, they stick together and we have to be mindful of them.
“But it’s an opportunity to be aggressive, be attacking and look to get the three points.
“I think Neil Harris has done a remarkable job there. When I look at the statistics I don’t see a club that want to build up the play," he added
"They have Matt Smith, who scored against us for QPR last season and can go direct to him.
“They have Connor Mahoney on one wing and Jed Wallace on the other, so that proves that they do have agile, technical, quick footballers.
“They have players who they can go direct to and have a good balance to their team. They can fight and battle for every second ball and have two huge central defenders.
“They carry a threat and their results show that they are a good side."