A number of Championship sides, including Birmingham, Huddersfield and Ipswich, are thought to be interested in the striker but reports suggest Reading will not allow him to go out on loan until he pens a new contract.
McDermott told the Bracknell Forest Standard: "It's not ideal.
"We would prefer he signs a contract and then goes out on loan and plays games.
"We will have to see and then reassess it.
"I need to talk to him and see where we have got to."