The pair laid on the goals for Papiss Cisse during last weekend's 2-2 draw at Swansea, a result which has eased pressure on Pardew in the short term.
"We've had to have the patience of a saint with Sammy and he'll admit that," said Pardew, who warned the younger brother of former United striker Shola that his days at the club were numbered.
"Now we need to see him deliver. The threat to him is still there - this is a big season for him.
"He did particularly well when he came on at Swansea. He's someone I've spoken about so many times over the past few seasons, talking about his potential.
"He's been a young player in the shadow of his brother for a long time. But this is a guy who is quick and has fantastic technical ability - he should be ripping this division up really, but he hasn't been.
"I was in a lift with him and his head was hitting the ceiling - he's six foot five as well. So he has looked a lot better this season but now he has to concentrate.
"Gabby had a great spell when he first arrived then lost his way a little bit.
"He's had to earn the trust of our fans and our staff to get a chance.
"But this season he looks really focused. Remember, he's only a young man and he could be a big player for us this year."
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