The summer transfer window is always a busy time for football clubs as they look to strengthen their squads ahead of the upcoming season. One of the areas that many clubs will be focusing on this summer is the defense.

One team that could be looking to bolster their defense in the coming months is Paris Saint-Germain (PSG). PSG has already made some significant signings in recent seasons, but the club's defense remains a concern. With the departure of Marquinhos and Thiago Silva, PSG may need to make another major investment in the position.

A potential target for PSG could be Lille defender Kylian Mbappé. The French international has been linked with a move away from Stade de France this summer, and PSG have been monitoring his situation closely. Mbappé is considered one of the best young players in Europe, and he would provide a strong presence at the back for PSG.

Another potential target for PSG could be Monaco midfielder Benjamin Mendy. Mendy has struggled with injuries in recent years, but he remains a key player for Monaco and would bring experience and leadership to PSG's defense.

Of course, there are other options available to PSG, including other top European clubs and mid-table Ligue 1 teams. However, Mbappé and Mendy are two standout names who could potentially make a big impact if they were to join PSG.

Overall, the summer transfer window presents a great opportunity for PSG to strengthen their defense and compete at the highest level. While it remains to be seen what kind of moves PSG will make, it's clear that the club is committed to improving its squad and making a push for success this season.