The 20-year-old, speaking to Manchester United’s official website, was asked various questions about his teammates and players he has competed against - and he reserved special praise for the Chelsea trio.
Asked which player he felt was the fittest he had come up against in his short career, Januzaj responded: "Branislav Ivanovic of Chelsea. He's strong all round."
Januzaj reveals more about teammates
As for the fittest player he has played with? "Must be Ryan [Giggs]”, Januzaj added. “He ran so much, even at his age!"
Januzaj revealed some other interesting snippets in the question and answer session. He believes the fastest player at Old Trafford is Antonio Valencia, rivalled by Wayne Rooney.
The Belgium international also said that his close friend Marouane Fellaini is the toughest tackler he has played alongside, that retired legend Paul Scholes was the best passer, and that either Robin van Persie or Radamel Falcao ranked as the best finisher he has played with.
Januzaj also praises Drogba and Hazard
Januzaj named Ivanovic’s Chelsea teammate Didier Drogba as the best finisher he has played against, while another Blues’ star - Eden Hazard - was named as the best passer.
Perhaps Januzaj’s most unexpected response, however, came to the question involving which defender is the toughest he has played against.
"Hard to pick,” he replied. “Cambridge's defenders were quite tough."
Januzaj played the entire 90 minutes against the League Two side back in January but, despite his best efforts, failed to break down Cambridge’s resilient defence at the Abbey Stadium.
Januzaj may need to consider his options this summer
The Belgian, who burst onto the scene in spectacular fashion last term, has endured a difficult second season as a professional at Old Trafford, with Louis van Gaal only using the winger sporadically.
Januzaj has not started a Premier League match for United since the 3-1 victory over Burnley in February, and was an unused substitute in the recent wins over both Tottenham and Liverpool.
With Juan Mata performing so well and Angel di Maria also waiting in the wings, Januzaj now faces the difficult task of breaking back into Manchester United’s starting line-up.
Left out of Belgium’s most-recent squad for the Euro 2016 qualifiers against Cyprus and Israel, Januzaj knows he must be playing regularly in order to prevent his career from stalling and may have concerns about his future at Old Trafford.
But after signing a five-year deal with the Red Devils in 2013, Manchester United are under no pressure to consider cashing in on the player if they prefer to keep him at the club.
Manchester United fans: is Adnan Januzaj good enough to make it at Old Trafford? Have your say in the comments below!