CINCINNATI — The Reds placed catcher Ramon Hernandez on the 15-day disabled list Monday to treat a knee injury.

Hernandez will have surgery to clean out his left knee on Tuesday. He’s expected to be sidelined for up to six weeks. Hernandez, who has been bothered by the knee for about two months, is batting .249 with five homers and 36 RBIs.

The Reds called up catcher Craig Tatum from Triple-A Louisville, where he batted .239 with three homers and 21 RBIs.

The Reds also swapped relievers, optioning right-hander Robert Manuel (0.00 ERA in three appearances) to Louisville and calling up right-hander Jared Burton for his third stint with the Reds. Burton had no record in 29 appearances with a 4.81 ERA.

Also, reliever Mike Lincoln had successful surgery to replace a bulging disc in his neck.

The right-hander underwent a two-hour operation Monday in St. Louis, where an orthopedic spine specialist fixed the problem. Lincoln is expected to make a full recovery and could resume throwing in September.