The former Netherlands midfielder insists the Hoops are "nothing" when they do not have their Glasgow rivals to contend with.
Former Netherlands star Edgar Davids has claimed, according to quotes published by the Scottish Sun, that Celtic are "nothing" without the rivalry of Glasgow neighbours Rangers as the two clubs gear up to resume their rivalry on a regular basis.
The Gers will return to the Scottish Premiership after a four-year absence following the completion of their journey back up the leagues after they were demoted to the Third Division upon being liquidated in 2012.
In their absence, Celtic have won three league titles in a row and look set to seal a fourth, but have been generally uncontested in the four years without their rivals.
Davids certainly believes that has been the case, and has gone even further by claiming the Bhoys go from a big club to nothing without the presence of Rangers.
The 43-year-old said, as quoted by the Scottish Sun: "Are Celtic still a big club? No. Without Rangers they are nothing - you need that rivalry.
"As a player they are the games you live for. When big teams play each other you automatically want to raise your game."
Celtic have already been sent a stark warning sign about the test they will face next season when Rangers return to top-flight football with Mark Warburton's side victory on penalties in the Scottish Cup semi-final.
It will be intriguing to see how the two clubs fare next season in the top flight, particularly with Celtic set to be under new management from this summer.