By Chris Emma–

BOURBONNAIS, Ill. (CBS) — For the first time since undergoing an appendectomy, Bears receiver Markus Wheaton was back on the practice field Sunday, but his day was short.

Wheaton suffered a broken pinkie finger in his left hand, Bears coach John Fox confirmed after practice. The details to a recovery aren’t yet known.

“I don’t know the full extent,” Fox said. “I don’t know exactly what’s going on with it, but he did break his finger.”

The injury to Wheaton occurred midway through practice Sunday as he was catching a pass in seven-on-seven drills. Wheaton was in clear pain and left with team personnel, who assisted him away on a cart.

Wheaton signed with the Bears on a two-year, $11-million ($6 million guaranteed) deal this past offseason as a veteran deep threat added to a new mix at receiver. He played in just three games last season, as his year was riddled by a shoulder injury and subsequent surgery.

The Bears also lost defensive lineman Roy Robertson-Harris to a concussion in Sunday’s practice. Defensive lineman Akiem Hicks (Achilles soreness), quarterback Mark Sanchez (ankle bruise) and tight end Dion Sims (shoulder) didn’t participate in practice.

Sunday brought the Bears’ final open practice at Olivet Nazarene. The team will hold a closed practice Monday before heading back to Lake Forest.

Chris Emma covers the Bears, Chicago’s sports scene and more for Follow him on Twitter @CEmma670 and like his Facebook page.

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