Portugal depend too much on star forward and captain Cristiano Ronaldo and that could cost them in Saturday's round-of-16 match against Croatia, according to Argentina legend Diego Maradona.

Ronaldo, 31, led his team into the knockout phase in France as third-placed finishers in Group F.

The Real Madrid forward scored twice in his Tuesday's 3-3 group draw against Hungary -- his first two goals of the tournament -- to give them a third draw in three matches.

Next up for Portugal is Croatia, surprise winners of Group D after beating Spain 2-1 in their last match and seen by many as the strongest team on their side of the draw.