Diego Maradona visited Napoli training on Wednesday and promised to be in Madrid for the Serie A club's Champions League trip.
Maurizio Sarri's men are third in the league table and head to the Santiago Bernabeu to face Real Madrid in the first leg of their last-16 tie.
Maradona, a club great who won two league titles with Napoli, plans to be in attendance.
"I deeply respect that Sarri is doing a very good job," he said.
"I wanted to see him up close and talk to him and tell him that I will be in Madrid to cheer on Naples."
Napoli are only four points off top spot in the Serie A but have a huge trip to San Siro to take on AC Milan on Saturday.