READ: Steve Smith's funny retirement letter to the NFL

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Steve Smith confirmed his retirement in a post-game interview after Week 17, and now it is official as he sent in a playful notice to the NFL.

The wide receiver did not end his career the way he wanted, as the Baltimore Ravens missed the playoffs at 8-8, but the 37-year-old realised his best days are behind him.

After 13 years with the Carolina Panthers and three with Baltimore, the five-time Pro Bowl receiver finished with 1,031 receptions for 14,731 yards and 81 touchdowns.

And on Friday, Smith posted on Twitter to reveal a note addressed to NFL commissioner Roger Goodell.

"Dear Commissioner Goodell," it read. "This is to notify you that as of today I, Steve Smith Sr., will no longer be antagonizing defensive backs.

"I am retiring from the National Football League. Sincerely, Steve Smith Sr."