Rautiainen, a 28-year-old forward, joins the GCK Lions from the Liiga's Ilvers Tampere. He was part of that team for the last six seasons. With his new team, the Finn signed a one-year deal.
Schlagenhauf was inked to a contract with the same duration. The 31-year-old suited up for the SC Rapperswil-Jona Lakers for the last two terms. Prior to that, the forward played for EHC Kloten, HC Lugano and HC Ambrì-Piotta, as well as with some other teams on short stints. He is a veteran of 676 National- and Swiss League games.
Christen, also signed to a one-year deal, joins them from SC Bern's junior department. Last season, the 20-year-old forward made one game for his club's main squad as well as twelve games for EHC Visp in the Swiss League, but mainly suited up for the U20.
Moving up from their own junior department, Silvan Landolt (defenseman) and Adrian Zimmermann (forward) will be part of the Lions for the next three seasons.