Gavin DeGraw I Will PERFORM By the End of the Month!

8/11/2011 7:10 AM PDT

Gavin DeGraw
is still recovering from the injuries he sustained during a brutal attack in NY this weekend, but insists he WILL perform again by the end of the month.

DeGraw's rep just released a statement ... saying the singer has been advised by his doctor to take additional time to recover from his concussion, broken nose and other injuries ... but he's determined to rejoin Train and Maroon 5 on August 24.

As TMZ first reported, DeGraw claims he was jumped by three unknown men on a NY street corner Sunday night . Cops are investigating the attack.