Impact, Whitecaps to retain their NASL status after they make MLS moves 24 Nov 2010 Even though both the Montreal Impact and Vancouver Whitecaps are moving to MLS, both are retaining their memberships in the second-division NASL. NASL chief executive officer Aaron Davidson confirmed that MLS is aware that both the Impact and Whitecaps are retaining their memberships in NASL, even though Vancouver makes its debut as an MLS city in 2011 and Montreal makes the move in 2012. “They can still have teams in NASL; those teams can have synergies with the MLS franchises or they can be standalone teams,” said Davidson Tuesday, over the phone from Paraguay.