Nagelsmann, whose sacking in March 2023 led to Tuchel's arrival, was tipped to return to Bayern, but has now extended his contract with Germany until 2026
India thrashed Maldives 3-0 in their final group game at Kathmandu's ANFA Complex on Tuesday.
India cruised into the semis as group champions with full points winning their opener 2-0 against Afghanistan.
Bangladesh won their first match 2-0 against Bhutan but slumped to a 2-1 defeat against hosts Nepal.
India's win has setup the neighbouring countries' second football clash within 10 days.
Bangladesh colts beat India in two meets, including the final, to win the SAFF Under-16 Championship trophy for the first time last week.
Nepal and Afghanistan will play in the other semi-final match. Both matches are set for Thursday.