Many people believe that it will take Arsenal a good few transfer windows to get a team that can start competing for the Premier League.

No one was expecting Unai Emery to instantly revolutionise the Arsenal team as it was clear that he needed time and funding to do so.

This January, therefore, was a great opportunity for him to start building his team for the future, however, things may not have gone to plan for many Arsenal fans. With that in mind here are the two biggest mistakes of their transfer window:

Losing Sven Mislintat

Sven Mislintat was at Arsenal for just over a year and no one fully knows the reason why he left this month, but it could well have been down to the fact that he was never going to be more than a glorified chief scout at Arsenal.

However, the German was one of the greatest assets the club had as he has a proven track record for unearthing some of the world's best footballing talent. The likes of Robert Lewandowski are an example of this.

Mislintat recruited Arsenal players like Pierre-Emerick Aubameyang, Sokratis Papastathopoulos and Bernd Leno to The Emirates. Things were starting to happen with the German at Arsenal and his departure may prove very costly, particularly given the fact that The Gunners are renowned for making some fairly poor transfer decisions.

Failing to sign Ivan Perišić

One player that Arsenal were heavily linked with over the transfer window was Inter Milan's Ivan Perišić. Other than Denis Suárez who they did indeed buy, the Croatian was probably the second biggest target.

The World Cup finalist would have added some serious quality to the Arsenal attack and his versatility would have come in handy as he can play as both an attacking midfielder and a winger.

The fact that they did not sign him has not only prevented their team of a high quality player which could have improved their chances of Champions League qualification as the season goes on, but it also sends a bad message to the rest of the Premier League that they are struggling to land new signings and that they may not have the power in the transfer window that they used to have.