Rubuta ci gaba don wannan sakin layi - An ƙididdige shi a matsayin na huɗu mafi kyawun mai karewa na Arewacin Amurka ta NHL Central Scouting kuma duk da kasancewa ɗaya daga cikin mafi ƙanƙanta a cikin shekaru, Siemens an zaɓi 11th gaba ɗaya a cikin 2011 NHL Entry Draft
ta Colorado Avalanche, tare da zabin da aka samu daga St Louis Blues tare da Erik Johnson da Jay McClement a musayar zagaye na biyu, Chris Stewart da Kevin Shattenkirk. A ranar 28 ga Yuli, 2011 Colorado Avalanche ya sanya hannu kan Siemens zuwa yarjejeniyar shekaru uku.