Despite having a bid accepted for the 23-year-old, Rovers have reportedly struggled to agree personal terms with the Scotland international.
"We had a bid and that was accepted, but we've not continued talks at this present moment in time," Bowyer told the Lancashire Telegraph.
"We're exploring all options, there might be a chance it might happen, if not we have to be prepared for it not happening.
"We've just got to keep as many plates spinning at the moment as we possibly can. We have a massive list and we're exploring all avenues at this moment but we are hopeful of bringing in certainly one or maybe two more."