Rovers have agreed deals for three loanees - including a goalkeeper - and are hopeful of adding the trio to the squad before the weekend.
However, the process of signing off the deals remains in the hands of senior officials at other clubs and has so far not been forthcoming.
As far as Rovers are concerned, they have done all they can on their side of each of the deals and remain confident that they will go through.
But each one requires rubberstamping by the relevant officials at the clubs before the players can be released.
It is understood that Darren Moore has been in regular contact with each of the clubs as he looks to get the deals completed.
With the likelihood now that Rovers will begin their season on the weekend of August 29 in the Carabao Cup tie at Blackburn Rovers, Moore is even more keen to add reinforcements as soon as possible.
So far this summer Rovers have added only Jason Lokilo to the squad and are in desperate need for new faces.
That is particularly the case in the goalkeeping position, where Louis Jones remains the only keeper on the books after Ian Lawlor was allowed to leave on loan.
Stoke City youngster Josef Bursik is a primary target for a loan move while Moore is also understood to have made significant progress on deals for attacking players.