The future of the former Rangers midfielder was one of the main talking points of the transfer window, with Blackpool rejecting offers from Liverpool and a transfer request from the player himself before accepting a bid from Tottenham late on deadline day.
However, there was not enough time for the deal to be completed and the 25-year-old will remain at Bloomfield Road until at least the end of the season.
And Eardley says that is a huge boost for Ian Holloway's men, even if he accepts Adam may not be with them much longer.
"Charlie played a massive part in us getting promoted," said Eardley. "I think he scored 19 goals last season from midfield, which is excellent, and he has proved again this season what a massive player he is for us.
"We have done well to keep him but I am sure Charlie will get his move in the summer or whenever because he is good enough to play for one of the big clubs. But for now he is still a Blackpool player and hopefully he can continue to play at his best between now and the end of the season."