With England captain Kane standing over the penalty spot, Bellingham walked up to him and whispered in his ear.
The Munich clash also pits two England superstars against each other.
Harry Kane has his eyes set on Robert Lewandowski's record for most Bundesliga goals in a season after scoring twice in a 2-1 victory over Eintracht Frankfurt, but the England striker acknowledges he needs "to get a move on".
The Bavarians, who saw Bayer Leverkusen end their 11-year-Bundesliga reign by securing the league crown two weeks ago, have only the Champions League trophy to fight for with departing coach Thomas Tuchel eager to leave on a high note.
Bayern Munich will meet Real Madrid, who beat holders Manchester City on penalties on Wednesday.
“They are fine and only went to hospital for a routine check-up,” said a spokesperson for the England captain.
The former Tottenham striker enjoyed a prolific record in north London derbies and a summer change of scenery made no difference.
The England captain is however no closer to that elusive first piece of silverware.
Kane is back in north London for the first time since leaving Tottenham last year as Bayern prepare for Tuesday's Champions League quarter-final first leg at Arsenal.
Brazil will hope not to break an ignominious 23-year-old record when they visit Wembley Stadium to square off against hosts England in a mouthwatering friendly on Saturday.
England captain Harry Kane will miss Saturday's friendly against Brazil and is "extremely doubtful" to face Belgium next week.
Harry Kane broke a 60-year record for most goals in a debut season while Jamal Musiala scored twice as Bayern Munich won 5-2 at Darmstadt on Saturday.
Bayern Munich forward Harry Kane said he is enjoying every moment as he aims to break more records in Germany after scoring a record setting hat-trick in Bayern's 8-1 thrashing of Mainz 05 on Saturday.
Kane now has 30 goals in his first season in Munich colours, matched the record for a maiden campaign set by Uwe Seeler for Hamburg in 1963-64
Bayern Munich striker Harry Kane hopes Tuesday's 3-0 win over Lazio, which secured progress to the Champions League last eight, will be a "turning point" in the club's season.
Harry Kane scored a goal in each half as Bayern Munich beat Lazio 3-0 on Tuesday to reach the Champions League quarter-finals 3-1 on aggregate.
Bayern Munich must follow their 2-1 victory over RB Leipzig with a winning run to get their season back on track, forward Harry Kane said.
Harry Kane scored the go-ahead goal to help Bayern Munich to a 3-1 comeback home win over Borussia Moenchengladbach on Saturday, keeping hot on the heels of leaders Bayer Leverkusen, who won 2-0 at Darmstadt.
"I've known Eric for a long time, played with him for a long time, and I know what a great player he can be for us," Kane said.