United were beaten 1-0 at Glanford Park after Jonson Clarke-Harris scored in the first-half on Saturday afternoon.
However, McArdle knows his side need to rectify that result and performance when Southend visit North Lincolnshire during the week.
Reflecting on the Rovers defeat, McArdle told iFollow Iron: “We are obviously disappointed to lose the game.
“The second part of the first-half is what killed us after starting reasonably well.
“We started on the front foot and got some good balls into the box, but for whatever reason we went flat and got sloppy.
“From our point of view, it was a sloppy goal for us to concede and as a game as whole.
“We always want to try and limit their opportunities and we did that, but we lost the game.”
The Iron tried to get back into the match during the second period, but failed to break down Graham Coughlan’s side and the defender admitted they lacked quality in the final third.
“In the second-half, we had more of a go with a higher tempo and showed more of a willingness to get back into the game,” said the 31-year-old.
“We had some good opportunities out wide to get the ball into good areas and, at times, the final pass was a bit sloppy.
“Their goalkeeper hasn’t had too many saves to make, which is a disappointment.”
The skipper continued: “We could have been better with our set-pieces as well because it gave us an opportunity to set things up and get the ball in the box.
“Again, the delivery wasn’t quite right, so that is something we have got to work at and make sure we look to improve for the game on Tuesday.”
After that loss, United are now placed 18th in Sky Bet League One, but McArdle wants the team to think positively and look forward to the visit of Southend on Tuesday.
He said: “When you are on the back of a couple of defeats, it is only ourselves that can put a shift in and get a result.
“It is not a case of coming into doom and gloom and have people sulking – we need to come in and be positive and go out there we are doing everything possible to get three points.”
McArdle also sees the quick turnaround for the midweek game as the perfect chance to bounce back.
“It is always a great chance to rectify the result from Saturday against a team that is in and around us,” said McArdle.
He added: “I’m expecting a tough game, as teams are looking to pick up as many points as possible from now until the end of the season.
“Each game is massive, so it is important that we prepare properly and that the team selected does everything they can to win the game.”
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