Premier League clubs' investment in homegrown mature players has reached a new high. Sky Sports analyzed the amount of money circulating within the league, which non-top-six teams sold players to wealthier opponents, and why Chelsea has become a central figure in the domestic transfer market.

This summer, Anderson, Morgan Rogers, and Sandro Tonali all commanded transfer fees of £100 million or more. They also confirmed an increasingly evident trend: the "big six" clubs – defined as Arsenal, Manchester City, Liverpool, Manchester United, Chelsea, and Tottenham Hotspur – are increasingly signing players from non-big-six opponents within the Premier League.
So, how much money have the top clubs in the league invested in signing players from other Premier League teams? Since the summer transfer window of 2016, the big six clubs have spent £2.8 billion on Premier League players from non-big-six teams. This trend has accelerated sharply, with a record £647 million spent last season, and this summer's window has already seen £420 million spent.
Premier League clubs are increasingly opting for internal league transfers. Last season, the total spending on intra-Premier League transfers reached £1.29 billion, significantly breaking the historical record.
What is the reason for this phenomenon? Clubs are increasingly keen to sign players who have already proven themselves in the league, thereby minimizing recruitment risks, but this certainty now comes at an increasingly high price.
A more valuable way to compare is to calculate the proportion of funds used to sign existing league players out of the total transfer expenditure.
In the 2018-2019 season, this proportion fell to a low of 14%, when most teams invested heavily in overseas players. But since then, this proportion has generally continued to rise, reaching 41% at this stage of the current summer window.
Which clubs rely most on the domestic transfer market?
Chelsea is the central club in Premier League transfer dealings. Since 2016, Chelsea has spent £862 million acquiring players from other Premier League teams, with most of this expenditure occurring after the new capital acquisition in 2022.
Brighton & Hove Albion and Chelsea continue to be the largest transfer channel within the Premier League, with a total transaction value of £263 million between the two clubs since the summer window of 2016.
Chelsea also spent £222 million on players from Leicester City and £156 million on Aston Villa players. Garnacho, meanwhile, was loaned to Villa this summer.
However, the big six clubs also sell a large number of players to other Premier League teams. Since the 2016-2017 season, Chelsea has far outpaced other teams in both buying players from league opponents (£862 million) and selling players to league opponents (£683 million).
Among the ten highest-value transfers so far this summer, six are intra-Premier League transfers, and Matheus Fernandes' £85 million move from relegated West Ham United to Tottenham Hotspur is not included in this statistic.
In fact, Tottenham Hotspur is the highest-spending club so far this summer, having spent £237 million, followed by Chelsea (£203.5 million) and Manchester City (£129 million).
Against the backdrop of the implementation of squad cost control rules, the big six clubs are increasingly recognizing that Premier League players can reduce transfer risk; at the same time, this also provides a way for the rest of the league's clubs to quickly acquire funds and improve their financial situation.
The trend is already clear: more Premier League money is staying within the league, and the big six clubs are increasingly looking for new signings from within the league.
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