Dell spent two seasons with Racing as its first general manager.
Louisville is now in an NWSL playoff position with five regular season games left.
Racing Louisville FC hosts North Carolina on Saturday night at Lynn Family Stadium.
Louisville saw two leads disappear in a disappointing defeat.
Howell moves on to Seattle with nothing but love for Louisville, a city the former Racing captain connected with over a short period of time.
Balcer wants to help Louisville claim its first NWSL playoff spot.
Racing delivered a complete performance to rout the Red Stars and get into an NWSL playoff position.
The defender has never missed a match for Racing Louisville FC and will now try to lead it to the playoffs.
The defensive midfielder is now a dominant centerpiece for a team wanting to push for the NWSL playoffs.
Louisville's general manager in Ryan Dell and head coach in Bev Yanez spoke to reporters Tuesday about the bombshell trade.