The free-agent ex-England international has been searching for a new club ever since his release from the Blues towards the end of the window and will now rock up in France.
This comes after Rangers were linked with a move for Barkley in the final days of the transfer window, with Ibrox fans disappointed by a perceived lack of investment.
Former Everton star Ross was even unveiled at half-time during the eventual 1-0 OGC Nice defeat to French rivals AS Monaco.
The move will now put to bed any suggestion Rangers could make a post-transfer window move for the 28-year-old player, who had been released from his Chelsea contract despite having a year to run on it.
Ross Barkley Rangers subplots as midfielder moves to Nice
Interestingly, in signing up with OGC Nice the midfielder will join up with former Rangers loanee Aaron Ramsey in France and its not the only Ibrox subplot attached to the deal.
Rangers midfielder Glen Kamara was also a reported transfer target for the busy Ligue 1 side at the end of the window but despite murmurs of £10m interest a deal never materialised.
Rangers boss Giovanni van Bronckhorst said after the window closed that he was delighted to retain the services of the Finnish international.
“I always wanted to keep Glen. We get many offers for players – for Glen as well,” said van Bronckhorst.
“I was always clear with Glen that I didn’t want to lose him especially when we are playing in everything including the Champions League.
“So I’m really happy that Glen is still here and he will make his contribution this season like he did last season.”
Whilst Rangers retained Glen Kamara and OGC Nice move for Ross Barkley, should the Ibrox club have resolved the situation with an out-of-sorts attacker?