Arsene Wenger says his scouts never stop working to bring the best talent in the world to the club.
According to the boss, club staff monitor transfer targets extensively throughout the year.
Arsenal signed five players in the summer and Wenger is not ruling out more additions in January.
"I always have lists that you readjust because you come in on Monday, someone has seen a player and you have to follow up, watch him again, then watch him again and someone else has to watch him,” he said. "Then when you come to a conclusion I have to watch him [again]. It takes time so that work never stops.
"For example, when we played against Southampton I saw Calum Chambers, saw his qualities, then you check on him again and follow up.
"To buy football players is not to go into a supermarket and just say that I want to buy a right back or a centre back. It’s to find the right quality.
"If you go out tomorrow you will see that everybody looks for the same positions everywhere. It’s not as simple as it looks.
"In January it makes it even more difficult because players are even less available than in June or July. But we will try to be creative and have one or two good ideas."
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