Timmons was examined Wednesday in Philadelphia by Dr. William Meyers, an abdominal specialist, and tests revealed that the rookie linebacker is not suffering from a tear or hernia, either of which might have required surgery and prolonged rehabilitation.
The former Florida State star did receive an injection to help reduce swelling in his groin and hopefully speed his return to the field. He has been experiencing discomfort and has not practiced in two weeks, and it has yet to be determined when he will return to practice.
"We're comfortable with what we heard [from Meyers]," coach Mike Tomlin told reporters on Thursday morning.
Camp has been a continuation of the frustrations and idleness that Timmons experienced in the spring. He initially injured the groin in his first practice session with the Steelers, and was sidelined for the rest of the spring, as Pittsburgh officials opted to take a cautionary approach, so that Timmons would be ready for the start of camp.
Timmons took part in the first few sessions at St. Vincent College, but then the groin problem resurfaced and he has been unable to practice. With the situation not improving, the Steelers decided to send Timmons to Meyers for an evaluation.
Pittsburgh's second-round choice, LaMarr Woodley of Michigan, also a linebacker, has been working with the first-unit defense.
The 15th player selected overall, Timmons signed a five-year contract with a maximum value of $15 million and $8.05 million in bonuses.
Blessed with explosive quickness to the ball and terrific athleticism, Timmons is a bit undersized at 6-feet, 234 pounds, but was timed in 4.66 seconds in the 40-yard dash at the combine. He also had a 35-inch vertical jump and a broad jump of 10-feet, 3-inches. Timmons demonstrated excellent strength by performing 25 repetitions in the standard 225-pound bench press.
For his college career, Timmons had 126 tackles, 22½ tackles for losses, eight sacks, one interception, two forced fumbles and two fumble recoveries. He also blocked three punts on special teams.
Most of that production came last season, when Timmons started all 13 games. In all, Timmons appeared in 38 games during his career.
Len Pasquarelli is a senior NFL writer for ESPN.com.