Lampard's advisor Steve Kutner admitted: "We're feeling left in the lurch and beginning to worry that Chelsea don't really want Frank.
"As things stand, he can leave in the summer for £5million under FIFA regulations or can sign a pre-contract with a foreign club in nine months' time and leave for free."
Kutner added: "His priority is to stay with Chelsea - so it is not difficult to understand why he is desperate to get it sorted out now.
"It's no secret that Jose Mourinho would love to team up with Frank again but the fans have got to understand that it is not Frank who is holding everything up.
"We were promised a definitive, final offer in January and we've still not heard a word from Chelsea."