Thieves have disrupted pre-match training for the Imps after snatching 20 high-tech training vests from Sincil Bank in a break-in.
The club is appealing for information after the vests were stolen from a car outside its ground in the early hours of Wednesday morning.
The vests are designed to be fitted with electronic devices that monitor movement and heart rate in order to assess player’s performance and fitness during training.
GPS tracking devices that work with the vests are a separate pieces of equipment and were not taken in the raid.
But the vests act as radars, the other technology is of no use without them
Manager Danny Cowley told the BBC that the theft is disrupting preparation for their match against Exeter.
He said: “It’s a really, really good tool for us that massively aids our ability to train the players,” he said.
“We really want those vest back because they are really important to us and the training of our players.”
A rock was used to smash the window of a car where the vests were being stored before being taken to the launderette.