The 2013/14 Premier League campaign is still in its early stages, but that doesn't mean there aren't players at clubs who must up their performances to keep their places in their respective teams' starting line-ups.
Whether new arrivals or old custodians, the five players on this list will be expected to pick up their performances over the next few weeks.
Try not to be too quick to react when you see the selected players - read why they make the list, then feel free to either agree or disagree in the comments' section below.
This is not a judgement on the players' abilities - as it happens they're all gifted footballers, which is why they should be performing better.
Click next to find out which players must improve...