Keller, 41, is playing his 20th and final professional season. He was voted to the All-Star XI along with Freddie Ljungberg in 2009 and last year Keller was named an inactive reserve.
On Wednesday, July 27 at Red Bull Arena in Harrison, N.J., the MLS All-Stars will face the defending English Premier League champions Manchester United in the 2011 AT&T MLS All-Star Game (live on ESPN2, Galavision, and TSN at 8:30 p.m. ET).
The First XI received the most votes at their respective positions from combined fan voting on three platforms - online at MLSsoccer.com, via text message, and via Twitter. The online and text voting ballot consisted of six players from each club, as chosen by a panel of media members.
A 4-3-3 formation was selected for this year's First XI because the third-ranked forward received more than twice as many votes as the fourth-place midfielder.