The Patriots’ trade for Lions tight end Michael Roberts fell through Friday when Roberts failed his physical, a league source confirmed.

Roberts reverted back to the Lions, who subsequently waived the third-year tight end.

The trade was made Thursday, and the Patriots weren’t giving up much — a conditional 2020 seventh-round pick, one they obtained from Atlanta in a trade for safety Jordan Richards last year.

Roberts, a fourth-round pick in 2017, has just 13 catches for 146 yards and three touchdowns in two seasons. He landed on injured reserve for the final eight games last year with a shoulder injury.


The Patriots’ quest to replace Rob Gronkowski now continues with Ben Watson, Matt LaCosse, Ryan Izzo, Stephen Anderson, and Andrew Beck. They also signed and released Austin Seferian-Jenkins this offseason.

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The Houston Texans ended their pursuit of Patriots director of player personnel Nick Caserio when they learned of Caserio’s contract terms with the Patriots, chairman and CEO Cal McNair wrote on Twitter Friday.

The Patriots filed tampering charges against the Texans on Wednesday

The Texans had asked for permission to interview Caserio after firing GM Brian Gaine a week ago, but the Patriots apparently believe the Texans overstepped their bounds in trying to persuade him to leave New England.

Ben Volin can be reached at ben.volin@globe.com. Follow him on Twitter @BenVolin