The duo remain close following the Dutchman's exit last summer.
Speaking to The Sunday Post, former Celtic defender Virgil van Dijk revealed that he remains close with some of old team-mates at Paradise, noting he'll be going on holidays with Stefan Johansen this summer.
Van Dijk spent two years in Glasgow after then-Celtic boss Neil Lennon plucked him from Eredivisie side Groningen, winning two Scottish Premiership titles - one under Lennon and another under Ronny Deila.
He only played with the Norwegian playmaker for about 18 months at Parkhead, but the Netherlands international is still close with the 25-year-old, revealing plans of a vacation shortly.
“I’m still in touch with a few of the players at Celtic. I’m friends with Stefan Johansen and we are going on holiday together," he said to The Sunday Post.
Like Van Dijk, Johansen has two Premiership crowns under his belt, though it's been a dismal 2015-16 season for the midfielder on an individual note, scoring one and setting up three goals in 20 top-flight starts.
With a new manager set to replace Deila this summer, it remains to be seen if Johansen has done enough to avoid being sold.