Bellingham has faced scrutiny from sections of the Spanish media and supporters following a dip in form after an outstanding debut season at the Bernabeu.
Injuries, including a shoulder operation and subsequent muscular problems, have disrupted his momentum and affected his performances.
However, Kroos dismissed the negative narrative while speaking alongside Rio Ferdinand on a podcast, insisting his quality remains unquestionable.
"His first year in Madrid was crazy. It surprised me quite a bit," the former Madrid man claimed.
"He is one of the most complete midfielders in the world. I see things in him that are very, very special.”
