Spent time on the Rock's practice squad in 2005 and 2006.
Signed by the Orlando Titans as an unrestricted free agent prior to the start of 2010 training camp.
Selected by the Washington Stealth in the first round (10th overall) of the Orlando Titans Dispersal Draft.
On August 13, 2012, Koneczny signed as an unrestricted free agent to a one-year agreement with the Colorado Mammoth of the NLL.
He once again represented the Czech Republic at the 2019 World Indoor Lacrosse Championship, recording five points in eight total games.