Mark Warburton has told QPR’s website he wants “two or three more” signings during this summer’s transfer window.
Since end of last season, Rangers have signed loanees Charlie Austin, Sam Field and Jordy de Wijs on permanent deals.
They have also brought in midfielder Andre Dozzell from Ipswich and young forward Alfie Lloyd from Yeovil.
Manager Warburton said: “There’s still work to be done. There’s still two or three more that we’re looking for to come in and boost the side.
“It’s a long season. We need to have the strength in depth.
“Like every club you’re financially challenged in terms of the Covid landscape and where clubs lie right now.
“We’ve got to use the budget wisely, but recruitment is everything for each and every team. So far so good, but a lot of work still to be done.”
Warburton is desperate for Rangers to secure the permanent signing of Stefan Johansen, who impressed while on loan from Fulham last season.
That deal was always likely to be protracted and has now been further delayed by an imminent change of manager at Fulham, with Scott Parker set to leave the club.
Fulham intend to give their new manager a chance to assess the squad before a final decision is taken on Johansen, who has a year remaining on his contract at Craven Cottage.
QPR also want to sign a right-back and left-back, with Todd Kane facing the axe.
Moses Odubajo, who played under Warburton at Brentford and is a free agent after leaving Sheffield Wednesday, will be signed to replace Kane if he proves his fitness during a pre-season trial with the R’s.
Left-back George Cox, previously at Brighton and now with Dutch club Fortuna Sittard, is also a target.
Rangers would also like to bring in a back-up keeper, which would allow Liam Kelly to move on.
Kelly is wanted by Motherwell, where he was on loan last season, and Dundee United.
The Scot has indicated that he does not want to return to west London to act as cover for first-choice keeper Seny Dieng.