Junior Lake could be optioned to Triple-A Iowa soon.
Junior Lake fanned all four times he was up Monday against the Red Sox.
Junior Lake returned to the Cubs starting lineup on Saturday, going 0-for-4 with a pair of strikeouts in a losing effort against the Nationals.
Junior Lake (head, leg) is not in Friday's lineup but is available off the bench.
Junior Lake did not show any concussion symptoms Thursday.
Junior Lake left Thursday's game against the Nationals after colliding with the outfield wall.
Junior Lake went 1-for-3 with two runs scored in a win over the Reds on Tuesday.
Junior Lake went 2-for-5 with a stolen base and two runs scored in Tuesday's win over the Pirates.
Junior Lake hit a pair of solo homers Saturday against the Marlins.
Junior Lake went 1-for-3 with a solo home run in Sunday's loss to the Padres.
Junior Lake had a three-run homer, two doubles and six RBI as the Cubs trounced the Cardinals 17-5 on Monday.
Junior Lake had a stolen base and a run scored in a loss to the White Sox on Tuesday.
Junior Lake went 0-for-2 and drove home the Cubs only run with a sacrifice fly in Monday's loss to the White Sox.
Junior Lake went 3-for-3 with a two-run homer in Saturday's 3-0 win over the Cardinals.