TORONTO - Light-heavyweight Thiago Silva and welterweight Thiago (Pitbull) Alves are off the UFC 149 card July 21 in Calgary due to injury.

Silva was due to meet former 205-pound champion Mauricio (Shogun) Rua while Alves was slated to face Siyar Bahadurzada, who was an injury replacement for Yoshihiro Akiyama.

Chris Clements of London, Ont., will step in for Alves at the Scotiabank Saddledome. Clements (11-4) won a split decision in his UFC debut at UFC 145 over Keith Wisniewski.

A new opponent for Rua will be announced at a later date.

In other UFC 149 news, Winnipeg bantamweight Roland Delorme (8-1) will meet Bibiano Fernandes (11-3) and welterweight Claude (The Prince) Patrick (14-2) of Mississauga, Ont., will fight James Head (8-2).

The previously announced Calgary main event pits featherweight champion Jose Aldo of Brazil against Erik Koch.