Millwall entered the international break off the back of a 'frustrating' defeat to Burton Albion and the manager believes Saturday's trip to the Sunderland can provide a turning point of sorts when the Sky Bet Championship resumes at the Stadium of Light.
The Lions are seeking their first away win of the campaign despite a string of impressive performances on the road early in the campaign.
"We had a great result at Cardiff and a really positive and strong performance at Sheffield Wednesday," Harris told millwallfc.co.uk. "But then we came back to The Den and the Burton Albion match was a real shame.
"We dominated the game from start to finish and I feel like we were robbed. That really upset us and angered us and now it's about bouncing back.
"We need to turn solid performances into results and this weekend is a great opportunity to do that."
The Black Cats are bottom of the table and will host The Lions looking for their first win at home in 2017.
"I think they have encountered a situation that a lot of teams, including us, have encountered in the past," Harris added.
"When momentum is going against you and you are swimming against the tide it can be tough to come out the other side.
"What we do know is that on paper they have an excellent side, but we have to impose ourselves on the game and impose ourselves on them.
"We know how tough it can be at The Den when momentum is against you and you have to work to get the fans back on side. It will be no different for Sunderland."
The manager will be without the services of Jed Wallace, whose suspension was upheld following an appeal, while Millwall's Northern Ireland, Scotland and Republic of Ireland contingent are expected to be available for selection following the latest round of international fixtures.