OWINGS MILLS, Md. -- Baltimore Ravens coach John Harbaugh announced Sunday that he won't provide any details of injuries or give timetables for a player's return in training camp.

Why is he doing this?

"Because last year I got asked about [Breshad] Perriman every day and I was wrong every single day," Harbaugh said. "So, what's the point?"

Perriman, the Ravens' 2015 draft pick, suffered what was first described as a minor knee injury last training camp and Harbaugh initially said the wide receiver would be sidelined for just one day. But Perriman eventually missed his entire rookie season.

Breshad Perriman lost his entire rookie season to injury. Tommy Gilligan/USA TODAY Sports

On Sunday, Harbaugh then went through his list of injured players, saying wide receiver Chris Moore "has a little tweak" without mentioning the specifics of the injury. On cornerback Maurice Canady's absence from practice, Harbaugh said the rookie has "a little issue that he's going to be out for a little while with."

The first time NFL teams are obligated to issue injury reports are the first week of the regular season.