The Premier League's January transfer window is well underway, with clubs across the league making their moves for the upcoming season. Here's a look at some of the key transactions that have taken place so far.

One of the most notable transfers in the January window was the signing of Manchester City defender Aymeric Laporte from Barcelona. The 25-year-old has been a key player for Barcelona and has made over 200 appearances for the club, but he decided to move to the Etihad Stadium after the arrival of Pep Guardiola. Laporte has already made his debut for Manchester City and is expected to be a key player for the team this season.

Another big deal was the loan signing of Arsenal midfielder Granit Xhaka from Borussia Monchengladbach. Xhaka has been a key player for Arsenal in recent seasons and has helped the team reach the semi-finals of the Europa League last year. He is now on loan at Monchengladbach until the end of the season, with the option to buy him permanently next summer.

There were also several other deals in the January window, including the loan signings of Liverpool defender Nathaniel Clyne and West Ham United striker Diafra Sakho. Clyne has previously played for Southampton and West Bromwich Albion, while Sakho has played for Paris Saint-Germain and Manchester United. Both players will provide competition for their respective teams' starting line-ups.

Overall, the January transfer window has seen plenty of activity in the Premier League, with many clubs looking to strengthen their squads ahead of the new season. With just one week left before the deadline, it remains to be seen how the final deals will shake out, but there are sure to be more surprises to come.