Kammala wannan jumla: Donovan an zaba shi na 96 a zagaye na huɗu na National Hockey League (NHL)
2008 da New York Islanders suka yi. Bayan kammala lokacinsa na biyu a Jami'ar Denver, da sauri ya sanya hannu kan kwangilar kwararru ta Islanders, wanda ya sanya shi ya buga wa kungiyarsu ta American Hockey League (AHL), Bridgeport Sound Tigers. Donovan ya zira kwallaye guda daya kuma ya taimaka sau hudu a wasanni shida na karshe na kakar 2010/11 AHL. A kakar wasa ta 2012-13, Donovan ya yi daidai da Justin Schultz don mafi yawan maki a tsakanin masu kare AHL tare da 48.