The challenges for the Boston Celtics' new head coach and their revamped roster

How can the Boston Celtics get back in contention with new head coach Ime Udoka?

ESPN's Adrian Wojnarowski reported Wednesday that Celtics president of basketball operations Brad Stevens has chosen Udoka, who had been an assistant with the Brooklyn Nets, as his successor on the sideline.

Udoka becomes just the third Boston coach in the past 17 years. The Celtics won a title under Doc Rivers and reached the Eastern Conference finals three times in Stevens' eight seasons as head coach, most recently less than a year ago.

After a disappointing season that ended in a first-round exit to his Nets, how can Udoka help a revamped roster get back on track and repeat that kind of playoff success? Let's take a look.

Rebuild defensive identity