The Premier League's big six have made a slow start to the summer transfer window, with only Manchester United adding to their squad since the end of the season with the £15m signing of young Swansea winger Daniel James.
Finding the right player at the right price is now becoming a challenge for even the biggest and wealthiest club. But if money was no object and the leading teams could make one signing to transform their starting XIs, whom should they go for?
With the transfer market likely to accelerate at the end of this month, ESPN FC has identified which player would make a big difference to each of the Premier League's top-six clubs.