With the NFL Draft only two days away, Antonio Callaway’s draft stock just took a significant hit as yet another incident was added to his already lengthy list of off-the-field concerns. 

On Tuesday, ESPN’s Adam Schefter reported that Callaway tested positive for marijuana — a banned substance in the NFL — at the combine in February. Callaway’s new agent, according to Schefter and NFL Network’s Ian Rapoport, confirmed that the sample came back diluted while Rapoport reported that Callaway claims the issue had to do with being over-hydrated. 

Former Florida WR Antonio Callaway — who some considered as talented as any WR in this draft — tested positive for marijuana at the combine, NFL sources told ESPN.

Callaway’s new agent Malki Kawa said it was for a diluted sample. Callaway hired Kawa about two weeks ago.

— Adam Schefter (@AdamSchefter) April 24, 2018

A talented player teams have been doing homework on is #Florida WR Antonio Callaway. Through his agent, Callaway confirmed his drug test sample at the NFL Combine came back diluted. Callaway has told those close to him he was over-hydrated and will address the issue with teams.

— Ian Rapoport (@RapSheet) April 24, 2018

At Florida, Callaway caught 89 passes for 1,399 yards and seven touchdowns from 2015-16. At the combine, he posted the third-fastest 40-yard dash time (4.41) among all receivers. If prospects were judged solely on their ability to play football, Callaway would likely be regarded as a first-round pick.

But issues away from the field have called into question if he’s worth a draft pick. Last week, NFL Network’s Tom Pelissero reported that “one scout who has done a lot of work on Callaway predicted he would’ve been a top-20 pick if he were clean off the field”