Van Dijk was on the books of Celtic from the summer of 2013 until the summer of 2015 when he moved to Premier League outfit Southampton.
The Netherlands international was superb during his time at the Hoops, and the 28-year-old switched to Liverpool from Southampton in January 2018.
Johansen played for Celtic from 2014 until 2016 when he joined Fulham in England.
I loved my time at Celtic and played with so many top players but a special mention for Stefan Johansen— Virgil van Dijk (@VirgilvDijk) March 31, 2020
Liverpool, who won the Champions League last season with Van Dijk playing a key role, are on the verge of winning the Premier League title this campaign.
Jurgen Klopp’s side are at the top of the league table at the moment with 82 points from 29 matches, 25 points clear of second-placed and defending champions Manchester City.
Meanwhile, Fulham currently find themselves third in the Championship table with 64 points from 37 matches, six points behind second-placed West Bromwich Albion and seven points behind leaders Leeds United.