MILLWALL'S attacking options will be boosted for the trip to Preston this weekend with all four of their fit forwards set for a full week's training.
Aiden O'Brien, Lee Gregory, Steve Morison and Tom Elliott all struggled last week, before declaring themselves fit on Friday for the clash with Hull.
O'Brien scored just six days after being carried off on a stretcher at Bristol City, but he and Morison were substituted in the 2-2 draw with the Tigers.
Harris praised the quartet for their determination to feature against Nigel Adkins' side.
"Aiden, Lee, Tom, even Steve to a certain degree, all put themselves forward last Friday to train, and all performed Saturday for me," Harris said.
"Those four in particular had a couple of days recovery after their exertions at the weekend but are fully training. They are back integrated and fit for the weekend."
Tom Bradshaw and Shaun Williams are Millwall's only injury absentees as they chase a first away win of the season when they go to Deepdale.
Harris was unsure whether he would have any forward players available against Hull, before O'Brien, Morison and Gregory surprisingly featured in the starting XI.
Harris insisted there was a rigorous process for players returning from injury.
He explained: "We put protocols in place to make sure they hit certain targets and certain levels, whether that's the morning conversations with the medical and sports science departments to building up training slowly.
"When you've been at a club for a period of time stability is key. I don't hugely change, I don't flit from one thought process to another in a short space of time. If you're stable in what you do then everybody knows what the protocol is.
"It means the players have trust in my staff but the staff also have trust in the players. If a player says 'I'm a lot better than I was yesterday', we believe that and can step the rehab up quicker.
"You can't judge a player's fitness completely on stats and sports science, but they have to go hand in hand.
"I think we saw at the weekend, whether or not they were at their best during the game, they certainly put a shift in."
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