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New Orleans Saints cornerback Patrick Robinson (21) works out during minicamp Wednesday, June 13, 2018, at the New Orleans Saints training facility in Metairie.

The New Orleans Saints are going to be without one of their top offseason additions.

The team is placing cornerback Patrick Robinson on injured reserve, according to a source.

The cornerback suffered a broken ankle during Sunday's win over the Atlanta Falcons. The injury was initially believed to be a high ankle sprain, but further testing revealed a more significant injury.

While racing to the outside to help make a tackle on a running play, Robinson's leg was rolled up by a Falcons player who dove for a low block, and the veteran cornerback was taken off on a cart.

It is not yet clear how the team will operate this week against the New York Giants. With Robinson out, P.J. Williams played the nickel role against Atlanta. Williams started the game at left cornerback and struggled against Calvin Ridley, leading to the Saints benching him in favor of Ken Crawley right before the end of the first half.

Robinson's season might not be over. Teams are allowed to bring back two players each season eight weeks after placing them on injured reserve.

Robinson, a former Saints' first-round pick, returned to New Orleans this offseason on a four-year, $20 million contract after spending time with the Chargers, Colts and Eagles from 2014-17. The hope was that Robinson would solidify the secondary by serving as the slot cornerback.

The Saints had several cornerbacks in for workouts on Tuesday, but it was not immediately clear if any of them signed. Former Washington and Oakland David Amerson is scheduled to visit this week, according to a source.

The team did add cornerback Arrion Springs, who was most recently with the Chiefs, to the practice squad. The corresponding move is not yet known.

New Orleans’ secondary has struggled each of the first three weeks. Along with some players simply getting beat, the group has also struggled with broken coverages and getting into proper position.

Losing a key member of the group without an obvious replacement on hand will is not something for which the Saints were planning. The Saints have had several other cornerbacks hook on with other teams after letting them go, including Marcus Williams (Tampa Bay), Arthur Maulet (Indianapolis) and Natrell Jamerson (Houston).

Follow Nick Underhill on Twitter, @nick_underhill.​