Laurent Koscielny says the return of two key Arsenal players has "made the difference" in recent games.
The France international opened the scoring against Newcastle United on Monday before Mesut Ozil found the net and then set up a third for Olivier Giroud.
Ozil and Aaron Ramsey are back in the first team after injury lay-offs and their input has been decisive, according to Koscielny.
"We had two very difficult months and some injured players have come back which is very important for us"
"We had two very difficult months and some injured players have come back which is very important for us," he told Arsenal Player.
"We can see with Mesut [Ozil] and Aaron Ramsey, it's very different [when they play] because they can make the difference. So it's important to stay like this and focus on our quality because [on Monday] we played well but we need to repeat these games all the time."
Koscielny scored his second goal of the season and he was happy to contribute at both ends.
"It was a free-kick and I just got to the ball," he said. "It's important for the team. I play for my team-mates and for the club so I try to give my best for the team and I'm happy to score. The most important thing is that Arsenal qualify for the Champions League.
"If we win against West Brom we will be qualified for the Champions League so we need to finish the job well. We have two games in the Premier League, we need to work harder for 180 minutes and after we have the FA Cup final."
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