Lake and Baxter join the Cubs from Triple-A Iowa, and they take the roster spots of reliever Brian Schlitter, who was optioned to Iowa, and catcher Welington Castillo, who was traded earlier in the day to the Mariners for right-handed pitcher Yoervis Medina. Medina will report to Iowa.
Lake was recalled for his second stint with the Cubs. He has appeared in four games this season, going 4-for-14 with the big league team. The outfielder was batting .250 at Iowa.
The Cubs selected the contract of Baxter, 30, who was batting .290 in 34 games at Iowa.