An undisclosed injury has forces welterweight prospect Erick Silva off the UFC 156 card and Jay Hieron will now face former Strikeforce fighter Tyron Woodley. 
UFC officials announced the change on Wednesday evening and the fight may end up being placed on the pay-per-view portion of the fight card.
Woodley (10-1) comes to the UFC via Strikeforce and opened his career with ten straight wins before being defeated by Nate Marquardt, which was for the vacant Strikeforce welterweight title.
Prior to his defeat against Marquardt, he had finished six of his opponents with five of those victories coming by decision. However, his last three wins have come by decision and one of those wins came against former UFC fighter Paul Daley.
Hieron (23-6) recently returned to the UFC in October, which he was defeated by Jake Ellenberger. He lost the fight by unanimous decision and it was only his second lost in his last 13 fights.
Prior to coming back to the UFC, he won the Bellator MMA season four welterweight tournament, which earned him a title shot against Ben Askren. He would go all five rounds with the champion and would lose a split decision, which Hieron felt he did enough to win the fight.
UFC 156 takes place on February 2nd at the Mandalay Bay Events Center in Las Vegas and will be headlined by Jose Aldo defending the UFC featherweight title against former lightweight champion Frankie Edgar.