Swansea manager Michael Laudrup believes his side need £200m if they are to improve on this seasons finish.
The Swans earned a respectable ninth-place finish in their second season in the Premier League, thanks largely to the signing of Michu for just £2m.
Laudrup believes that is the best they can do though without significant investment.
The Spaniard told BBC Sport: "Unless we find a couple of hundred million pounds I think last season we achieved nearly the maximum we can in terms of the table.
"There are always things you can improve, but there are not many higher positions we can look at."
As well as the impressive position in the table, the Welsh side also won the Capital One Cup at Wembley, earning them a place in next season's Europa League.
That success could be a difficult one to build on though according to Laudrup.
He continued: "Even consolidating is going to be very difficult. Some of the teams below us this season will invest heavily.
"The likes of West Ham, Newcastle and Aston Villa. They are huge clubs who want to take the place where we are right now."
Laudrup has only been in charge of his side since last year, when he
replaced Brendan Rodgers who moved to Liverpool and the 48-year-old's first season in English football proved to be highly successful but there are areas for improvement.
A striker is wanted to partner Michu, who himself could be the attention of transfer speculation this summer, while Ashley Williams is another potential transfer target for other teams.
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