N'Gog has linked up with former Liverpool team-mate Shelvey at Swansea, after moving from Bolton Wanderers and penning a contract for the remainder of the season.
Shelvey, who arrived from Anfield in the close-season, is confident N'Gog will be a success, explaining the Frenchman's future at Liverpool was always going to be under threat from "bigger names".
"I worked with him for 18 months at Liverpool so I know what he can do," said Shelvey.
"David had a good record at Liverpool. But, with no disrespect to him, there were a lot of far bigger names in front of him at Anfield like Fernando Torres.
"He couldn't get too much of a look-in. But if he gets a chance here, he'll take those chances. At this club, the fans make you feel loved."
Shelvey was on the scoresheet for Swansea on Tuesday as they ended a run of eight Premier League games without a win by beating Fulham 2-0.
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