The Southampton winger - hugely influential in his loan spell at Rovers in the first half of the season - is now back in training, having recently joined the League One high-fliers for a second temporary spell for the rest of the season.
Sims, 23, proved a major hit in his initial half-season loan at the club, which was cut short when he suffered a hamstring injury in mid-December which ruled him out for six weeks.
Moore, whose side welcome fellow form side Oxford United on Saturday, said: “It is good to have Josh back in training and it is really great to have him. We will monitor him and see how he is over the next few weeks.
“We have got him back, but let’s not put too much on him, too much too soon. Let’s get him back integrated with us and get some real training under his belt and body contact that you get in training with other players that he has not been involved too much with.”
Rovers fans have yet to get their first glimpse of another January arrival in John Bostock, but Moore has sent out a positive message regarding his fitness.
The Rovers chief said: “He is really close now. Every day that passes by now for John is a step to being closer and in and around our first team and match-day squad and getting in.
“He has got in some excellent work and we have topped and loaded him up and he seems to be getting fitter and stronger day by day in the work we have asked him to. He has completed it to a good level.”
On Rovers’ transfer window business which saw the club bring in Omar Bogle, Scott Robertson, Ellery Balcombe and Scott Robertson alongside Sims and Bostock, Moore - who has seven loan signings in his squad and is permitted to only use on a match-day - added: “We knew we had to get one or two bodies in and beef up the midfield department and areas in the front end of the pitch and in terms of getting the bodies we have got in, we are relatively pleased now.
“We get on with the second half of the season and the big concern is now getting one or two back off the treatment and integrating one or two players that have come on board into a system and squad so that when they are called upon in the next few weeks, they are able to perform at a level for the football club."