 In the 2009–10 season, Sertich returned and improved his season totals to 28 points in 53 games before he was again struck down with a concussion against the Milwaukee Admirals on February 10, 2010, ruling him out for the remainder of the season.On April 17, 2010, Sertich signed as a free agent to a one-year contract with Swiss team, EHC Olten of the second tier National Liga B.In each of his three seasons with Olten, Sertich led the team in points and was amongst the league's top scorers.