For the &lt;a href="1991%E2%80%9392_SM-liiga_season"&gt;season 1991/92&lt;/a&gt; Ketterer returned to Jokerit Helsinki, which had meanwhile returned to the SM-liiga. With Jokerit, he became champion straight away, which meant the goalkeeper's fourth league title in a row. Subsequently, teams in North America became aware of him and he was selected in the 1992 NHL Entry Draft in the fifth round as a total of 107 players from the Buffalo Sabers. At first, however, the international remained with Jokerit and in 1993 took third place in the European Cup with his team. He then went to the United States, but from 1993 to 1995 stood exclusively for Buffalo's Farmteam, the Rochester Americans, in the American Hockey League between the posts, so that he was with Färjestad BK in the Swedish Elitserien. With the FBK he was in the &lt;a href="1996%E2%80%9397_Elitserien_season"&gt;season 1996/97&lt;/a&gt; Swedish champion. In the European Hockey League, however, he and his team were eliminated in the group phase. From 1997 to 1999 the 1992 Olympian played again for his home club Jokerit in the SM-liiga before he ended his career at the age of 31. In 2005 he was inducted into the Finnish Hockey Hall of Fame as a total of 160 players.