McLintock thinks Arsene Wenger needs to do some business during the window despite the club sitting at the top of the Premier League table.
Former Arsenal defender Frank McLintock believes that the Gunners need to sign a new centre-back during the January transfer window, having raised questions about whether Per Mertesacker is still capable of cutting it at the highest level, according to Talksport.
The 31-year-old was part of Germany's World Cup winning squad in 2014, and has been an integral member of Arsene Wenger's side since his arrival from Werder Bremen in 2011. This season, he has made 15 appearances to help the side move to the top of the Premier League table.
Nevertheless, McLintock - who played over 300 league games during his time at Highbury - thinks it is time that Wenger considered signing a long-term replacement for the German.
"I'd like to see an improvement in January, especially at centre-half," he told Talksport.
"I think Per Mertesacker has been a bit fortunate. He's been a great pro and a great player for Germany, but I can't see him getting in the Bayern Munich, Barcelona or Real Madrid teams. That's a position that needs to be filled."
Mertesacker's experience can make him a very valuable member of the squad, and his leadership is likely to help in the coming months as the side attempt to end their wait for the league crown.
However, his lack of pace has been exposed on numerous occasions, but with a lack of options to choose from - Laurent Koscielny and Gabriel Paulista are the club's only other senior centre-backs - Wenger has often had little option but to pick Mertesacker, even if he didn't wish to.
And while Arsenal are now top of the table, they have had several warnings this season that they need to add more depth at the back. If Wenger ignores McLintock's calls for a new arrival, then it may prove to be their downfall in the title race.