Neither Chris Wondolowski nor Shea Salinas are technically one-club men, but both players have been with the San Jose Earthquakes for a long time and are really linked with the Quakes in the public imagination.
It turns out, they are in fact among the longest-serving active players at an MLS club at present.
Sporting Kansas City had a story on their website that noted they currently have the longest-tenured head coach in MLS (Peter Vermes) and longest-tenured player with one club (Graham Zusi), both starting at the club in their current roles in 2009.