NBA All-Star forward Anthony Davis has agreed to terms on a three-year maximum contract extension worth $186 million ($A283m), a deal with the NBA’s richest-ever annual extension at $62 million ($A94m), ESPN reported Friday.

When completed, the agreement would link Davis to the Lakers through 2028 at a cost of $270 million ($A411m), according to the agent for Davis, Rich Paul.

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Davis, who helped the Lakers win the 2020 NBA crown alongside four-time NBA Most Valuable Player LeBron James, was a key factor in the Lakers’ run to last season’s Western Conference finals, where they were swept by eventual champion Denver.

The 30-year-old American averaged 25.9 points, a career-high 12.5 rebounds, 2.6 assists, 2.0 blocked shots and 1.1 steals a game last season while shooting a career-best 56% from the floor in his fourth campaign since being obtained in a deal with the New Orleans Pelicans.

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Davis became eligible for the maximum extension on Friday and Lakers general manager Rob Pelinka wasted no time in securing the 6-foot-10 (2.08m) star for the club for another five seasons.

It gives him the chance to unite with 38-year-old playmaker James and a strong supporting cast to bring another crown to the Lakers, who share the all-time NBA record with Boston of 17 titles.