Dallas Cowboys linebacker Sean Lee has revealed that he will have to undergo more tests on his neck before he is cleared to return to action.

Lee sustained a neck injury during his side's defeat to the Chicago Bears last week and as a result missed their loss to the Green Bay Packers.

"We have to do more tests with the doctors," Lee told ESPN. "Until they clear me I won't be in there. That's the key. Hopefully they'll clear me pretty soon.

"Obviously I'd like to be back as soon as possible, but I don't know exactly when that is because the doctors have to give me a timetable."

The Cowboys are 7-7 in their season and are second in the NFC East, one game behind the Philadelphia Eagles.