Gasol, 37, averaged 10.1 points, 8.0 rebounds and 1.0 blocks for the San Antonio Spurs this season, appearing in 77 games.
In five postseason games, Gasol averaged just six points and 4.8 rebounds in 18 minutes per contest.
As for San Antonio's other veterans, point guard Tony Parker said he would like to return next season, per Jabari Young of the San Antonio Express-News:
Manu Ginobili, on the other hand, remains undecided on retirement:
The biggest offseason question for the Spurs, of course, will be the future of Kawhi Leonard, who played in all of nine games due to a quadriceps injury. Things took a turn for the bizarre when Leonard was reportedly cleared to return in February by team doctors but remained out of action through the playoffs.
According to Michael C. Wright of ESPN.com, the Spurs plan to have an "all-hands-on-deck summer meeting" with Leonard.
Per that report: "With head coach Gregg Popovich expected to take the lead, the Spurs plan to meet with Leonard over the summer to gauge whether the sides can work out their differences and continue what has been largely a positive and productive partnership, sources said."
As for Gasol, should he reverse course and call it a career, his next stop would be the Hall of Fame. The six-time All-Star and two-time NBA champion has averaged 17.4 points, 9.3 rebounds and 1.6 blocks in his 17-year career. He's been one of the NBA's most consistent and proficient big men during his tenure, playing for the Memphis Grizzlies, Los Angeles Lakers, Chicago Bulls and San Antonio Spurs.