Celtic preparing bid for £10m in-demand French defender
The Toulouse centre-back is wanted by a number of clubs but is unsure on his future.
The Scottish champions held talks with the Ligue 1 side last week and are set to make an offer.
With Spanish side Celta Vigo keen on the 26-year-old, with other French clubs also showing an interest Toulouse have put a £10million price tag on the player.
Jullien made 35 appearances for the French side last season but has yet to make his mind up on whether he would be keen to move to Parkhead, according to local paper La Dépêche du Midi.
Boss Neil Lennon has targeted the defence as a priority with a right-back also required following the departure of Mikael Lustig.