Chad Bettis spent his Sunday scouting a minor-league game at Salt River Fields. On Monday, the veteran Rockies right-hander started chemotherapy, two weeks after learning his testicular cancer had returned.

Bettis was pitching through spring training in full health after blood tests showed him apparently cancer-free last month following successful surgery on Nov. 29. But on March 10, Bettis said a new round of tests showed that his cancer was not gone.

“Chad has handled this so gracefully and courageously,” Rockies manager Bud Black said. “He’s kept such a positive frame of mind around the clubhouse.”

Bettis probably will need multiple rounds of chemotherapy. But he is aiming to pitch with the Rockies sometime this summer, Black said, perhaps by the all-star break. A timeline for his return is far from certain. Doctors need to see how he reacts to the treatment for cancer. It is possible Bettis could miss the season.