NBA Power Rankings: Top 5 Eastern Conference teams before NBA opening night 2019-20

#4 Toronto Raptors

The Toronto Raptors hope to remain competitive whilst also building for the future

The Toronto Raptors were handed a big boost last week after Pascal Siakam agreed on a new five-year contract with the team. Kyle Lowry also penned a one-year extension just days earlier and it seems that the Raptors are determined to at least enter the season with the aim of defending their NBA championship.

Nevertheless, the loss of Kawhi Leonard cannot be understated, while Danny Green's effort on both ends of the court will also be missed. Fred VanVleet and OG Anunoby will get more game time as the Raptors have one-eye on the future, while the aging duo of Serge Ibaka and Marc Gasol will be motivated as they look to earn a new deal next summer.

Ultimately, the Raptors could still opt to offload its veterans ahead of the trade deadline, although as it stands, the current roster is more than good enough to hold their own against the top teams in the East.

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#3 Boston Celtics

Jayson Tatum is set for a bigger role with the Celtics following the departure of Kyrie Irving

The Boston Celtics lost Kyrie Irving in free agency, although the All-Stars departure could prove to be a blessing following his frequent criticisms of the roster. By the end of the disappointing 18-19 season, it was also clear that Jayson Tatum needed to get away from the ball-dominant Irving, and the 21-year-old is primed to enjoy a huge season as he leads the Celtics offense for the first time.

In terms of signings, the Celtics bought in Kemba Walker and Enes Kanter, and while Walker is an excellent replacement for Irving, there are big doubts regarding Kanter's defense. Nevertheless, the Celtics could be handed a significant boost if Gordon Hayward can build on his encouraging offseason, and Jaylen Brown will also put up big numbers as he looks to earn a max-contract extension.