OWINGS MILLS, Md. -- Lamar Jackson remains sidelined with a right hamstring injury as the Baltimore Ravens returned from their bye.

Jackson did not practice Monday for the struggling Ravens, which creates uncertainty whether the two-time NFL Most Valuable Player will return for Sunday's game against the Chicago Bears .

Last week, Ravens coach John Harbaugh expressed hope that Jackson would come back after missing the past two games with the injury. But Jackson was not on the field Monday for Baltimore's first practice after its bye.

Harbaugh declined to talk specifically about Jackson when asked whether he expected his Pro Bowl quarterback to practice this week.

"I think all the guys are working really hard to get back, I can tell you that," Harbaugh said after Monday's practice.

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