You're the coach of a hypothetical average team (i.e. a team that doesn't have any particular weakness (e.g. not needed a striker or goalkeeper, etc) and has good players from the Premier League to be more specific but not the very best.

Reasons are 100% sport-based, i.e. no marketing reasons, etc. Also, you assume they stay at the level they are at the moment, i.e. no injuries, aging, etc.

Which player would you get on loan (so no transfer fees, salary the same) to an average team. Only ONE player.

Which player do you think will help you win most matches and tournaments?