[6] During the 1987–88 season, Kerr made a first team total of four league and two cup game appearances together with a 3-month loan spell at then Fourth Division club, Peterborough United.

[7] The English Football League rule change that increased the number of player substitutions during a game from one to two per side having been introduced at the start of the previous 1986–87 season.

Making a total of 48 appearances and scoring 22 times in league and cup games[4] for the Buckinghamshire club on its way to finishing in fourth position behind eventual Conference champions of that season, Maidstone United.

[13] Following his involvement with the U.S. squad as it prepared for the 1990 FIFA World Cup, Kerr had spells during 1990–91 with French Third Division side Boulogne-Sur-Mer and Northern Ireland club Linfield.

[15] Following the collapse of the MSL during the summer of 1992, Kerr briefly spent time as an assistant coach with the Duke Blue Devils men's soccer team before returning to England, joining Isthmian League club Chertsey Town in the fall of 1992.

He then moved to Football League club Millwall signing as a free agent on February 26, 1993[16] before temporary returning to the U.S. during the off-season summer break to continue his assistant coaching duties at Duke.

Kerr went on to make a total of 40 first team appearances for Millwall in league and cup games during the 1993–94 and 1994–95 seasons, scoring 7 goals in the process.

[18] On February 8, 1996, the Dallas Burn selected Kerr in the ninth round (eighty-third overall) on the 1996 MLS Inaugural Player Draft.

[19] On June 27, 1996, Kerr was part of the first in-season trade in MLS history when the Burn dealt him to the New England Revolution for Zak Ibsen.

In 1998, Kerr was appointed player-coach with the Worcester Wildfire of the USL A-League, the following year the club was renamed the Boston Bulldogs after a change of ownership.

On December 19, 2007, Kerr was named head coach of his alma mater, Duke University of the Atlantic Coast Conference following the retirement of John Rennie.