Picking the first of Birmingham's three to watch is a simple task – Clayton Donaldson having scored more than 50 goals over three years with Brentford.
The popular former Hull, York, Hibernian and Crewe striker was a popular figure with the Griffin Park faithful and helped fire the Bees to promotion from League One last season.
Brentford were keen to keep Donaldson and have him spearhead their assault on the Championship, but the Blues offered him a better deal which, at the age of 30, was hard for him to turn down.
Bees boss Mark Warburton said at the time: “Clayton was an important member of the squad last year. We were delighted with his contribution.
"As a result, we sat down with him and offered a very good two-year contract with an option for a third year.
“The contract met all the demands of the player and the agent and every indication was given that the offer was more than acceptable.
"However, the way in which the game now appears to work means that clubs receive mixed messages and as a result Clayton has joined another club.
"From our perspective, we only want players that are 100 per cent committed to Brentford Football Club.”
Picking two other men to watch is not as easy a task as it may have been in previous years, with not as many star names at Brum than their fans have enjoyed watching in recent times.
However, there are a couple of names which will jump out at Brentford fans, not least that of Dave Cotterill , who was part of the Doncaster side which beat the Bees to promotion from League One in THAT infamous last game of the season in April 2013.
The Welsh international winger, who joined the Blues from Doncaster this summer, then mocked Uwe Rosler, who was Bees boss at the time, by tweeting Harry Forrester, who joined Rovers from Brentford that summer, a picture of his champions' medal and told him to show it to Rosler.
Another face Bees fans will recognise is another summer signing for Brum, Stephen Gleeson , who was brought in from MK Dons.
The 26 year old midfielder made more than 200 appearances over five years with the Dons and always impressed when playing against the Bees, leading some supporters to tout him as a possible signing for Warburton this summer.