Rovers climbed into fourth place when they won 44-22 at Whitehaven in their match in hand. But with 11 games to play until the competition splits, Sharp’s men are just a point ahead of sixth-placed Batley Bulldogs and four clear of Swinton Lions, who are in eighth spot.
Sharp said: “It is the first time we’ve been in the top four this season and I am pleased with that.
“But it is very tight, tight as a drum and points difference is going to be really important at the end of the year.
“There is a lot of hard work to do, but we have got into the four with a busted team and we are getting some troops back now.
“There’s only Michael Channing and Scott Turner missing, so hopefully we can get some momentum to build on.”
Rovers came away from Whitehaven with no serious new injury concerns and Sharp said Kyle Briggs’ unexpected return from ankle damage was a bonus.
“He made a miraculous recovery,” Sharp said.
“He was supposed to be three or four weeks away, but he came off the bench and played 20 minutes as preparation for this week’s game against London, which is important for us.”