The Reds are confident that utility back Ben Lucas will be able to shrug off a groin problem ahead of their crucial Super Rugby match against the Brumbies on Saturday.

Lucas injured his groin playing in the Reds 34-20 victory over the Lions on the weekend after he moved to five-eighth in the second half.

The utility back is renowned as a versatile attacker and a reliable tackler and started the match at fullback but covered in defence for returning playmaker Quade Cooper.

Reds medics have assessed the 24-year-old and is set to be restricted to light duties at training for the start of the week.

Reds coach Ewen McKenzie said that he expects Lucas to regain full fitness for Saturday's pivotal match at Canberra Stadium.

The Brumbies lead the Australian Conference and have an eight point lead on the Reds and a home victory over the Reds would almost certainly seal a place in the play offs.

"I'm pretty confident," McKenzie told AAP of Lucas' playing chances.

"We might have a few blokes on light (training) duties today but I think, by the end of the week, we will have the right blokes available."

Earlier this season the Reds beat the Brumbies 20-13 in Brisbane.