ST. LOUIS -- Adam Dunn was a late scratch to the White Sox lineup Wednesday with a slightly sprained right ankle.

Slated to start in left field against the St. Louis Cardinals, Dunn was replaced by Dayan Viciedo on the field and in the No. 3 spot in the Sox lineup.

It wasn't immediately known how Dunn injured the ankle but a Sox spokesman said it wasn't related to any foul balls. Dunn played left field in the Sox' 6-1 victory on Tuesday night and was fairly active, including cutting off a ball in the gap and charging in to catch a fly ball. The only time he ran the bases was on his 436-foot home run, his 21st of the season.

He did not appear to be hurt on Tuesday night.

Dunn is the only Sox to appear in all 61 games. His 21 homers rank second in the major leagues and has him on pace to hit a franchise record 56.