Vucevic, 28, averaged career highs in points (20.8) and rebounds (12) per game last season for the Magic and reportedly is working on a new contract with Orlando. But ESPN reported Thursday that if they can’t reach an agreement, the Celtics and Lakers could be destinations for the All-Star. The Celtics and Horford had been expected to reach new contract terms until earlier this week, when he reportedly rejected a three-year offer. Related News NBA Draft 2019: 3 takeaways from trade-filled night The Celtics, who now expect to see center Al Horford walk in free agency, apparently have a replacement in mind: Nikola Vucevic.According to Shams Charania of Stadium, the 7-foot center will be “one of the top priorities potentially” for the Celtics. NBA free agency rumors: Al Horford draws interest from Lakers, 2 other teams Rick Pitino leaves coaching job in Greece to pursue NBA role While Vucevic’s offensive skills would be an asset for Boston, he’s not a strong defender, which seemingly makes him a bad fit for coach Brad Stevens’ emphasis on defense.The Celtics reportedly also have “checked in” with the Rockets about a trade for big man Clint Capela.