Shields says he’s done

? Pro Bowl guard Will Shields is retiring after 14 seasons with the Kansas City Chiefs.

The 35-year-old announced his decision on his Web site – www.willtosucceed.org – Sunday. He said the physical requirements of football had become more difficult with each passing day.

Shields, who has played in a franchise-record 224 games, made his 12th Pro Bowl appearance last season to tie the record held by Minnesota guard Randall McDaniel.

Shields’ agent, Joseph Linta, did not immediately return a message left by the Associated Press.