It marked a fifth win in six games to place Brighton in the mix for European qualification.
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And Wieffer, discussing their form turnaround, said: "We spoke with each other, also with the more mature players in our team.
“Of course, James Milner, Pascal Gross, James Milner, Danny Welbeck.
“We had a lot of good conversations with each other to work hard, also if we don’t play well.
“Also today we didn’t play maybe our best football the whole game.
“In the end, if you work hard, press the opponent and create chances out of that, it helps the team a lot. Today that helped again.
“That is the man thing that changed in the last couple of games I think.”