Before his Tuesday press conference, Eagles defensive coordinator Vic Fangio was surprised with a jersey of his favorite Phillies player, Dick Allen

They have been protective of Andrew Painter, Aidan Miller, and Justin Crawford. But as the trade deadline approaches, it looks like the price for a top reliever will be high.

Here's what you need to know about the trade deadline, including the top players on the trade block and what moves the Yankees and Mets have made so far. In years prior, it used to be set in stone on July 31 at 4 p.m. ET. According to MLB.com, the commissioner's office can set the deadline from a date range of July 28 and Aug. 3.

To set the stage for the sprint to the deadline, here's a primer based on what I'm hearing from front office executives across the league.