According to MLB.com, the Chicago White Sox came to terms with Mark Buehrle on a four-year contract extension on Sunday. The terms of the deal have not yet been announced.

The agreement was announced to the U.S. Cellular Field crowd immediately following the final out in Sunday's 6-3 White Sox victory over the Minnesota Twins.

Update

ESPN is reporting the deal is worth $56 million over 4 years but could be worth up to $75 million over 5 years if Buehrle is traded.

And the official info from the White Sox...

Left-handed pitcher Mark Buehrle and the Chicago White Sox have agreed to terms on a four-year, $56-million contract extension through the 2011 season, White Sox General Manager Ken Williams announced today.  Under terms of the agreement, Buehrle will be paid $14 million for each of the next four seasons. 

Buehrle, 28, is 103-70 with a 3.77 ERA (646 ER/1,543.2 IP) and 898 strikeouts over eight seasons with the White Sox (2000-present). 

“There is no question what Mark Buehrle means to this organization, our clubhouse and our fans,” said Williams.  “He is one of the very best left-handers in the game today.  We cannot be happier to reach this agreement with Mark, and now look forward to this team winning games the remainder of this season and in future years with Mark on the mound.”