Contexts: (Thanks) "The summer would be an ideal time for a swoop as Matheus turns 18 in June." "Liverpool have a history with Matheus' parent club, Grêmio, having signed Lucas Leiva in 2007 and former Reds left-back Fabio Aurelio currently plies his trade at the Porto Alegre club." "The game has settled a bit after that furious start. Brazil in possession."
Isn't a swoop an unexpected or undesired move to get a transfer where a club gets a player before the other team can react properly?
Yes, there is definitely a sense of surprise and speed involved. A possible synonym could be 'pounce'?
Example: 'The team pounced to sign the player' suggests that he transfer happened before any other team could react.
We have added ply one's trade to our glossary.
A friend of mine mentioned that plying one's trade suggests the idea of 'selling skills' which is nicely linked to the idea of playing for a team.