Carlisle United manager Graham Kavanagh says he has exhausted the free agent market in the search for a striker.
Kavanagh's side lost to Luton in their League One opener, while Derby ended their Capital One Cup progress.
"I think we've explored every avenue for players who are out of contract," Kavanagh told BBC Radio Cumbria.
"We'll have to start to look at clubs who have players who aren't in the team.
"I've come up short in the last few days with a couple of names and made a lot of enquiries but the people I've spoken to about the individuals haven't given me the feedback I've been hoping for.
"We'll have a look and see what comes up in the next week or two."