Chelsea have struggled defensively this season, and it seems that the club is searching for a key player addition to help improve their defensive performance.

In recent weeks, Chelsea have been linked with a number of potential signings, including Virgil van Dijk from Liverpool, who has been linked with a move to Stamford Bridge. However, despite these rumors, the Blues have yet to make any significant signing in defense.

The issue of Chelsea's defensive weakness has been a concern for many fans and analysts, and the team has struggled to keep clean sheets this season. The lack of depth in Chelsea's defense has also made it difficult for the team to cope with injuries or suspensions, which has led to the team conceding goals at an alarming rate.

Despite the challenges, Chelsea have continued to play competitive football and remain one of the top teams in the Premier League. However, the team's inability to defend effectively could potentially cost them points and affect their chances of winning major titles.

It remains to be seen whether Chelsea will make a significant signing in defense this transfer window, but the club will need to address their defensive weaknesses if they hope to compete for major honours in the coming seasons.