Kemba Walker said this past offseason one of the reasons he signed with the Boston Celtics in free agency was because of Jayson Tatum.

Walker and Tatum hung out in Paris and talked about the possibility of playing together on the Celtics. Fast-forward to today and Walker has had the best seat in the house in terms of watching Tatum's rise to stardom in the NBA, and the guard has a warning for the rest of the league:

“He’s been playing his ass off. I’m proud of him and it’s only gonna get better,” the Celtics guard said of Tatum, via Jay King of The Athletic. “We’re going to see a lot of performances like that from him night in and night out. It's super exciting.”

Tatum has appeared in 52 games for the Celtics this season. He’s averaging 22.9 points, 7.0 rebounds and 2.9 assists while shooting 44.5 percent from the field, 38.6 percent from beyond the arc and 82.2 percent from the free-throw line.

The Celtics are 39-17 on the season. They are in third place in the Eastern Conference standings. Boston is coming off a tough road loss to the Los Angeles Lakers. The Celtics are back in action on Tuesday when they take on the Portland Trail Blazers, who are still playing without superstar point guard Damian Lillard.

The Celtics, though, are still without Walker. Tatum, Jaylen Brown and Gordon Hayward will once again have to carry the load on offense until the All-Star guard is comfortable playing again on his ailing knee.