The Phillies acquired Thomas from the Athletics on Monday in exchange for right-hander Seth Johnson.
Thomas owns a .628 OPS with 10 home runs and a 34 percent strikeout rate in 253 big-league plate appearances. The 25-year-old was one of the Athletics' better prospects not long ago, and he's a career .285/.360/.546 hitter in the minors who is under team control through 2031, making him an interesting flier for Philadelphia. Thomas will likely report to Triple-A Lehigh Valley initially, but the right-handed hitter could get some chances with the Phillies versus left-handed pitching down the stretch.