Mourinho has signed a contract until the end of the 2022-23 season with a basic salary of £8m a year.
This campaign, however, has been poor and the club sit in 14th place in the Premier League having won just two of the club's last nine games. "We believe he will bring energy and belief to the dressing room", said Spurs chairman Daniel Levy, per the club's official website.
"I always told about the club's potential", Mourinho said.
"I look to our history and you see that the academy is always giving talents the first team need". After the match, Mourinho said, "This is not the best league in the world, this is football from the 19th century", and, "The only [other] thing I could bring was a Black and Decker to destroy the wall".
Mourinho needs to do everything he can to make sure Kane, who had a close relationship with Pochettino, still feels content at the club - and hopefully winning matches will help to convince him.
Levy described Mourinho as "one of the most successful managers in football".
The Lilywhites are now sat 14th in the Premier League table.
Mourinho won the UEFA Champions League with both FC Porto in 2004 and Inter Milan in 2010. Spurs have won just three times on the road since January - all in the Champions League.
Mourinho expressed his excitement at taking over a talented roster.
Mourinho will look to get his new side back on track when they visit West Ham this Saturday in a week 13 bottom-of-the-table clash.
The Argentine coach was widely lauded as something of a miracle worker by elevating Tottenham into English football's established elite and inspiring its improbable run to a Champions League final previous year.
"It is not a decision the board has taken lightly, nor in haste".