Lampard and co. are hoping the club can wrangle a deal for Cahill should the Rams be promoted back to the top flight.
But a loss in one of the richest games in world football will see Derby struggle to be able to afford Cahill.
His £75,000—a-week wages would be hard for Derby to finance with the one caveat being that the former Bolton man would be available on a free transfer.
Cahill won an abundance of trophies during his time with Chelsea in which he won two Premier League titles, two FA Cups, a League Cup, a Champions League and a Europa League.
Lampard won multiple trophies with Cahill at Chelsea (Image: GETTY )
However, things have taken a sour turn this season, having made just eight appearances in all competitions for the Blues in their whole campaign.
Cahill has noted that he believes he has more years left in him at the top level but manager Maurizio Sarri couldn’t see it, exiling him from the first team with no explanation.
Cahill said he lost respect for Sarri in an interview with the Telegraph before Chelsea’s final home game of the season against Watford.
“It's been really terrible for me personally," he said.
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Lampard spent 13 years with Chelsea and became their all-time top scorer (Image: GETTY )
"It's been very difficult. I have played on a regular basis over the previous six seasons and I've won everything with Chelsea, so to be watching from the stands is something I didn't expect.
"I know how the whole club works, I've got a big relationship with all the players and staff, and yet none of that has been utilised.
"If you are not playing a player, any player, for two, three, four games, then you don't have to give a reason for that. But if it gets to eight or nine games, then you have to explain the situation. What's going on? But the manager hasn't done that.
"I see some of the situations with players who won the title with Chelsea, not just myself, and it just hasn't been right. It makes it very hard for me to have respect for someone who has not respected what some of us have won with the club."