Rubuta ci gaba don wannan sakin layi - A ranar 5 ga Maris, 2014, an yi musayar Mitchell zuwa Buffalo Sabres, tare da zagaye na biyu na zagaye a shekarar 2014
da zagaye na biyu a 2016 (wanda aka siyar zuwa Montreal don Josh Gorges), a musayar Matt Moulson da Cody McCormick. Mitchell ya gama kakar wasa da kwallaye 2 da maki 10 a wasanni 67.