TODAY, 12:03pm: The procedure wasn’t a major one, according to Clark Spencer of the Miami Herald (via Twitter). Prado could return in three to five weeks after a “cleanup” operation.

9:18am: Prado will undergo surgery, according to Jon Heyman of Fan Rag (via Twitter). The precise nature of the procedure and anticipated recovery period are not yet known, but clearly he won’t be a trade candidate for teams looking at third base options.

YESTERDAY: With his knee failing to progress as hoped, Marlins third baseman Martin Prado is weighing a surgical approach, manager Don Mattingly tells Craig Davis of the Sun Sentinel (via Twitter). He’ll make a final decision tomorrow.

The 33-year-old infielder had drawn some interest as a trade candidate. In the midst of a roster reshaping and organizational sale, the Marlins have seemed motivated to move some of the sizable contract — three years and $40MM — that Prado just began this season.

Leg troubles and performance problems, though, had already made a trade seem like an unlikely proposition. Prado was slashing just .250/.279/.357 in his 147 plate appearances on the year, and recently hit the DL for the third time after two prior placements connected to hamstring troubles.

In any event, today’s news makes it all but certain that Prado won’t be traded in the next few days. His contract will surely clear waivers in August, so he could conceivably be dealt at a later point, though that’d likely also require that he make it back on the field in time to prove his health.