"It turned out worse than we wanted, but certainly a lot better than it could have been," coach Dick Jauron said.
Team physicians give Robinson a chance to return in time to practice for the Sept. 9 season-opener at Baltimore.
Originally the Bears thought Robinson's back pains Monday came from the after-effects of heat exhaustion suffered July 21.
Robinson had injured the same disc last December and his season ended with three weeks remaining. At that time the Bears opted for conservative treatment, but decided Friday on surgery.
The Bears will not bring any new receivers in for the moment.
"We've invested time in some young players. They need to come through right now for us," Jauron said about third-year receiver Marty Booker and second-year receiver Dez White.
If the Bears could get first-round draft pick David Terrell signed, it would help solve their manpower shortage at wide receiver. Talks had stalled as of Saturday afternoon over the fifth year of a five-year deal.
"It's a matter of structure. We hope to get that resolved at any point," general manager Jerry Angelo said.
"We're talking about the escalator that is going to trigger that fifth year (salary), what incentive that is. And what's the amount when and if that incentive is met in the fifth year," Angelo said. "It's a matter of structure We hope to get that resolved at any point."