The UFC announced today that Jeremy Horn will replace the injured Thales Leites and make his anticipated return to the Octagon to battle Nate Marquardt at UFC 81.

Leites was forced to withdraw from the event due to a broken hand he suffered in training. The American Top Team fighter is slated to undergo surgery as soon as this week.

Horn hasn't competed in the UFC since 2006 at UFC 60 where he defeated Chael Sonnen.

Here's a look at the updated UFC 81 fight card:

Main Card

Antonio Rodrigo Nogueira vs. Tim Sylvia

Brock Lesnar vs. Frank Mir

Ricardo Almeida vs. Alan Belcher

Jeremy Horn vs. Nate Marquardt

Under Card

Tyson Griffin vs. Gleison Tibau

Tomasz Drwal vs. David Heath

Marvin Eastman vs. Terry Martin

Rob Emerson vs. Keita Nakamura