(CHICAGO) – Chicago White Sox rookie Yermin Mercedes wrote in an Instagram post on Wednesday night that he is "stepping aside" from baseball indefinitely while also apologizing to the team for not "accepting some of their decisions." The post was accompanied with a picture of the words "it's over." Mercedes wrote that he wants to apologize to all those who he inadvertently offended as a consequence of his immaturity like members of the radio, television, and press. Mercedes also wrote in his post to his teammates and the White Sox organization that he was sorry for failing as a human being and for not accepting some of their decisions. He said he is stepping aside from baseball indefinitely. The 28 year old Mercedes earned AL Player of the Week to open the season and hit .415 with five homers and 16 RBIs in 22 games in April, but he struggled after that. His batting average dropped to .271 before he was demoted to Triple-A Charlotte at the beginning of July. The White Sox were seemingly caught off guard about Mercedes' intentions Wednesday night. Team officials say they have not received any official notification from Yermín concerning his future plans. Manager Tony La Russa, who learned about Mercedes' post after the White Sox's 7-2 loss to the Twins on Wednesday, said he would try to reach out to him. Mercedes wore his emotions on his sleeve, playing with swagger as an older rookie, but he was the subject of controversy in May when La Russa criticized him for swinging at a 3-0 pitch late in a blowout victory over the Minnesota Twins. Mercedes responded that he wasn't going to change. Mercedes ran into other issues besides swinging at a 3-0 pitch. He was benched in an early May game for arriving to the ballpark late, and he expressed disappointment after being sent down to the minors.