Dolphins add QB Mark Gronowski and LB Cam Riley

The Miami Dolphins have signed quarterback Mark Gronowski and linebacker Cam Riley, according to Yahoo Sports. The moves bring two additions to a roster that typically churns through training camp as teams evaluate depth at quarterback and linebacker and sort out special-teams options.

Gronowski, a quarterback by trade, is now part of Miami’s quarterback competition and developmental pipeline. In the NFL, additions at the position during the preseason often reflect a combination of emergency depth, practice-squad needs, and the chance for a new look in quarterback drills and game-planning for preseason roles.

Riley, listed as a linebacker, gives the Dolphins another candidate for defensive snaps and (depending on how the coaching staff uses him) potentially special teams. For teams in August, linebacker depth matters because of the number of reps and the risk of late-camp attrition. Even when starters are locked in, reserves are measured by coverage assignment discipline, tackling fundamentals, and the ability to learn multiple run-pass fronts quickly.

From the team-building standpoint, the Dolphins’ decision to add both a quarterback and a linebacker fits a common preseason pattern. It addresses two areas where injuries or performance fluctuations can force a rapid shift: quarterback availability and the linebacker group’s ability to rotate through packages.

For Gronowski and Riley, the next step is earning practice repetitions with their respective units. Camp signings like this generally come with an immediate test, how quickly they grasp scheme details, and whether they can separate on technique in live work rather than simply participate.

As always, roster decisions in the preseason can change quickly. Until Miami’s official transaction record is confirmed and any corresponding roster designations are clarified, details such as whether either player is intended for the active roster, practice squad, or a temporary camp role remain unclear.