Championship football returns this weekend after the two week international break, and it's back to Ewood Park for Rovers.
Millwall make the long trip up to East Lancashire from London, with The Lions currently two points and five places above Tony Mowbray's side in the league table.
Mowbray has confirmed that Tosin Adarabioyo, Jacob Davenport and Dominic Samuel are all back in contention to play a part against The Lions, as the injury list shortens.
Corry Evans represented Northern Ireland in their two games against Luxembourg and Germany in the last week and is back in the Rovers squad for the weekend battle.
One definite absentee is Ben Brereton, with Mowbray confirming that the frontman will be out of action for six to eight weeks after having a small procedure on a knee injury picked up last month.
Visiting boss Harris has confirmed that winger Jiri Skalak won't head north, whilst Tom Elliott won't be travelling either.
Jon Dadi Bodvarsson, Shane Ferguson and Jayson Molumby have all been on international duty in the last week or so and are back available for the visitors.
Millwall have drawn their last three games in all competitions and have only failed to score in one of their first eight matches of the season so far.
Rovers have a good recent record against The Lions, beating Millwall on six of their last eight meetings at Ewood Park, with Mowbray unbeaten in his last five games against the Londoners.
Rovers are also unbeaten in the last seven clashes against Millwall, with the last defeat coming way back in 2002.
In fact, Mowbray hasn't lost to Harris in any of their five managerial duels.
Kick-off at the weekend is at 3pm, and if you can't make the clash then you can track all the action on our social media channels and iFollow Rovers.