QPR are set to host promotion chasing Boro at Loftus Road later, and Marsh is confident that his former side can be successful.
QPR head into the match with Middlesbrough in good form, and they should by full of confidence.
In their last three matches in front of their own fans, the R’s have dispatched with Birmingham City, Derby County and Brentford with ease - scoring a combined total of seven goals without reply.
QPR also picked up a 1-1 draw with Preston North End at Deepdale in their most recent fixture.
The strong run of results has pushed Rangers up to 11th place in the Championship table, and given them a very slim chance of making it into the play offs.
Middlesbrough, on the other hand, have their eyes firmly set on claiming an automatic spot.
Boro’s season was threatening to unravel earlier in the month, but they seem to have got back on track with a victory over Hull in their most recent match.