Pats get to work at rainy Gillette

FOXBOROUGH, Mass. -- The New England Patriots opened their 2013 training camp in the rain on the practice fields outside of Gillette Stadium on Friday morning in front of a nearly full-capacity crowd.

Per the NFL's collective bargaining agreement, the team was restricted to practicing in helmets and shorts, with the offense donning white jerseys and the defense wearing blue. The quarterbacks, as well as safety Devin McCourty, wore red noncontact jerseys (McCourty underwent offseason shoulder surgery).

Tight end Rob Gronkowski (back/forearm; PUP list) and defensive linemen Armond Armstead (unknown; non-football injury list) and Corey Grissom (unknown) were the only players not spotted on the field for the session.

Wide receivers Julian Edelman (foot; PUP), Kenbrell Thompkins (unknown), Mark Harrison (foot) and offensive lineman Nick McDonald (unknown; PUP) were spotted on the field at the start of practice but were not in uniform to participate. Thompkins later put on his jersey and helmet to work with members of the team's training staff.

Quarterbacks Tom Brady and Tim Tebow were greeted with robust applause as each took the field.

As head coach Bill Belichick alluded to in his pre-practice press conference, the on-field workout mirrored a minicamp practice both in terms of tempo and the drills the team was able to do. The team will conduct its first full pads practice on Sunday.

The impact of the rain was seen through some off-target throws, uncharacteristic drops and players slipping on the field. However, rookie Josh Boyce, who was limited during offseason workouts coming off a pre-draft foot injury, looked sharp in receiving drills, as did free agent pickup Danny Amendola.