The Cubs placed Wicks on the 15-day injured list Friday with a right oblique strain, Ryan Herrera of AllCHGO.com reports.

Wicks (2-4) took the loss Tuesday, giving up four runs on seven hits -- including three home runs -- and two walks over five innings as the Cubs fell 4-3 to the A's. He struck out four.

Wicks did not factor into the decision in a loss to the Dodgers on Wednesday, allowing seven runs on eight hits and four walks over three innings while striking out two.

The Cubs reinstated Wicks (oblique) from the 60-day injured list ahead of his scheduled start Sunday against the Nationals in Washington.

Wicks (oblique) is expected to be reinstated off the 60-day injured list ahead of his start against the Nationals on Sunday, Meghan Montemurro of the Chicago Tribune reports.

Manager Craig Counsell said that Wicks (oblique) could draw a start this weekend against the Nationals, and as a result, the 24-year-old southpaw was scratched from Friday's rehab start with Triple-A Iowa, Meghan Montemurro of the Chicago Tribune reports.

Wicks (oblique) will make another rehab start with Triple-A Iowa on Friday, Meghan Montemurro of the Chicago Tribune reports.

Wicks (oblique) struck out four while allowing one hit and no walks over four scoreless innings in his rehab start Tuesday with Triple-A Iowa.

Wicks (oblique) struck out three and allowed four earned runs on five hits and two walks in his second rehab start Thursday with Triple-A Iowa. "He's got a minimum of two [rehab starts] left before he's kind of ready to pitch for us regardless," Cubs manager Craig Counsell told MLB.com on Friday, when asked about a timeline for Wicks to return from the 60-day injured list. "So, he's got time left. I think at the start of it, health is most important. And as we get closer to making a decision, then results start to get factored in more, absolutely."

Wicks (oblique) covered 1.2 innings and struck out two batters while giving up six earned runs on four hits and three walks in his first rehab outing Saturday with Triple-A Iowa.