Delhi Capitals
Ricky Ponting, who was appointed head coach of the Delhi-based franchise ahead of IPL 2018, will retain his position for IPL 2020. Sourav Ganguly, who acted as advisor for the team in IPL 2019, has left his position after becoming BCCI president.
Chennai Super Kings
Stephen Fleming continues his long-standing association with Chennai Super Kings as their head coach. He took up the post with the second season of IPL, in 2009, and has been their coach since [he was head coach of Rising Pune Supergiant in 2016 and 2017 when CSK was suspended for two years.
Kings XI Punjab
Anil Kumble has replaced previous head coach Mike Hesson as director of operations of Kings XI Punjab for IPL 2020. Kumble has, in the past, worked with Royal Challengers Bangalore and Mumbai Indians. Andy Flower has been named as the assistant coach. Courtney Walsh replaces Ryan Harris as the bowling coach, while Jonty Rhodes replaces Craig McMillan as the fielding coach. Wasim Jaffer was named batting coach.
Kolkata Knight Riders
Brendon McCullum retired from international cricket in 2015, and from all cricket earlier this year. He will take up his first high-profile coaching role post-retirement, as head coach of the Kolkata Knight Riders. He replaced Jacques Kallis, who had held the post since 2015. Abhishek Nayar will be the assistant coach, replacing Simon Katich who moved to the Royal Challengers Bangalore. Nayar earlier held the post of the mentor, which will now be taken up by David Hussey. Kyle Mills was named bowling coach, in place of Omkar Salvi.
Source : (wisden.com)