The Lions will take on Leeds at The Den in the Championship on Saturday afternoon.
Neil Harris’s side will head into the match against the West Yorkshire outfit on the back of a 2-2 draw with Queens Park Rangers at Loftus Road in the league.
The Whites will head into the match as favourites, having made a strong start to the 2017-18 Championship campaign, and are currently sitting at the top of the league table.
Morison is well aware of the fact that Leeds have made a flying start to the season, and knows that to get anything from Saturday’s match, he and his teammates have to be on top of their game.
“It’ll be a massive game, they’re flying at the minute,” Morison told News at Den. “They’ve had a really good start to the season. They scored five goals last weekend so we need to be right on our game.
“We need to recover well from the game Tuesday. I think it’ll be a packed house at The Den on Saturday, which is what we want every week.”
Leeds have a much better team than Millwall do, and the Whites should be able to pick up all three points from the encounter with relative ease.
Morison was on the books of Leeds from 2013 until 2015 before joining Millwall on a permanent contract after a loan spell at the Lions.