The phrase "transfer market" refers to a process in sports, especially soccer, where players can be bought or sold by clubs. It's like a marketplace where teams can transfer or trade players between them. Full definition
Need a big summer in transfer market and an injury free pre season. (justarsenal.com)
The club needs an aggressive summer transfer market to go out and sign one of these players who in turn can take them to the next level. (caughtoffside.com)
End of transfer market or beginning even before pre season? (justarsenal.com)