Trevor Benjamin has returned to Peterborough after his loan spell at Boston came to an end.
The 28-year-old failed to score during three appearances for The Pilgrims.
"We can't continue expecting other football clubs to pay for players we bring in on loan and on that basis, it's getting harder to get anyone in.
"Two weeks ago, I was assured that I could use part of Brad Maylett's wages when he joined Chester City on loan, but that's not materialised.
"I appreciate resources are tight, but given the numbers available, considering the loss of Maylett and Benjamin, plus Stephen Vaughan, Simon Rusk and Richie Ryan, it is imperative that we do something."