The 28-year-old, a £20million summer signing from relegated Bournemouth, scored his fifth and sixth goals of the season on Sunday as the Magpies beat high-flying Everton 2-1 at St James' Park.
He told NUFC TV: "It will give the boys a lift. Three points always shoots you up the league and 11 points now, it's something to build from.
"At the minute, there's a good togetherness about the group and results obviously help with that as well, so this week is going to be a good week.
"It's a shorter period until our next game, but we'll be professional, make sure we've got our heads screwed on and get ready for Southampton away."