All players i recommend were tested with Rangers and various other low league sides, players mainly tested with Rangers due to higher wage budget availability
Craig Gordon - GK - Free (£3k-£4k wage)
James McFadden - AM/F LC - Free (£4k-£5k wage)
Royston Drenthe - M L - Free (£20k-£30k wage) large wage but excellent player
Matthew Bates - D RLC - Free (£10k wage)
Nuno Reis - DC - £2k (10k wage) - Olhalense on loan from Sporting B.
Pavel Verstraete - D LC - £8k (£1,4k wage) - Zulte Waregem
Bernard Malanda - D/DM RC - £22k (£1.2k wage) - Zulte Waregem. Lower league wonderkid
Togay Arslan - AMC MC - £50k (£10k-£15k wage) - HSV II
Paulo Hernan Hinostroza - M C - £22k (£7k wage) - Zulte Waregem. Difficult to get a work permit.
Emre Can - D/DMC - £75k (£9k Wage) - FC Bayern II. A gem
Lukas Raeder - GK - £60k (£1.5k wage) - FC Bayern II.
Stephen Hendrie - DL - £22k (£500 Wage) - Hamilton
Pablo Gil - D RC - £22k (£500 Wage) - Sparta Prague (transfer listed) Ace player
The players mentioned above are mainly for teams with low transfer budgets but with reasonable wage budgets, if you want me to compose a list of players for bigger teams then i will do that happily