Wong, 29, is coming off a career season in which he flashed great versatility, with 95 tackles, 5 ½ sacks, 39 quarterback pressures, three interceptions, two passes defensed and one fumble recovery.
The seven-year veteran, who played outside for the Texans since joining the team as an unrestricted free agent in 2002, will move inside for the 2005 campaign as the Houston staff shuffles the linebacker corps.
The new five-year contract created by the extension is worth $17.65 million and Wong will earn $7 million this season. Wong was entering the final season of his original contract with the Texans.
It is the second time in four days the Texans have stepped up financially to secure the long-term services of a key player. On Saturday, the Texans agreed with standout tailback Domanick Davis on a four-year extension worth nearly $22 million.
Talks on the extension for Wong, who began his NFL career with the Minnesota Vikings in 1998, recently escalated. The team's defensive captain, Wong indicated to the Texans management that he wanted to finish his career with the club.
A former Stanford star, Wong has appeared in 108 games and totaled 471 tackles, 20 ½ sacks, six interceptions, 44 passes defensed, three forced fumbles and two recoveries.
Len Pasquarelli is a senior NFL writer for ESPN.com. To check out Len's chat archive, click here.