Lightning coach Cooper unsure if injured G Ben Bishop will return for Saturday night's Game 5

Tampa Bay Lightning goalie Andrei Vasilevskiy, left, deflects a puck as teammate Jason Garrison (5) and Chicago Blackhawks' Brandon Saad (20) watch during the third period in Game 4 of the NHL hockey Stanley Cup Final Wednesday, June 10, 2015, in Chicago. (AP Photo/Charles Rex Arbogast) (The Associated Press)

Chicago Blackhawks' Jonathan Toews collides with Tampa Bay Lightning's Jason Garrison (5) as Lightning goalie Andrei Vasilevskiy, bottom, watches during the first period in Game 4 of the NHL hockey Stanley Cup Final Wednesday, June 10, 2015, in Chicago. The Blackhawks won 2-1 to tie the series 2-2. (AP Photo/Nam Y. Huh) (The Associated Press)

Tampa Bay coach Jon Cooper is unsure if injured goalie Ben Bishop will return for Saturday night's Game 5 of the Stanley Cup Final against Chicago.

Bishop sat out the Lightning's 2-1 loss in Game 4 Wednesday night with an undisclosed lower body injury. Bishop didn't practice Friday, which was predetermined.

The series is tied 2-2.

Andrei Vasilevskiy will get another start if Bishop can't go. The 20-year-old Russian rookie won Game 2 in relief, and played well Wednesday in his first playoff start, giving Tampa Bay little reason to worry about the potentially precarious position.