The Rangers announced late Friday night that Beltre had scar tissue removed as part of a cleanup in the thumb on Thursday.
General manager Jon Daniels disclosed last week after the Rangers' season ended in the AL Division Series that the 36-year-old third baseman played much of the season with a torn ligament in his thumb. He injured the ligament on a slide May 31, and was on the disabled list from June 1-22.
Beltre missed two games of the ALDS because of a strained lower back. He finished the season with a jammed finger on his left hand, but hit .287 with 18 homers and 83 RBIs in 143 games.