Radoja, 26, made his name in his native Serbia with Vojvodina before heading to Spain with Celta in 2014, where he was a regular for four years.
However, having refused to sign a new contract last summer, Celta completely froze Radoja out of their side – and his deal ended in June, meaning he's a free agent having failed to sign for anyone this term.
English teams are queueing up for Radoja, and whilst he would be a coup for Leeds in the Championship, West Ham actually need him more.
The Hammers have endured problems in midfield early on this season. Declan Rice hasn't hit top form yet, Mark Noble is out injured, and Jack Wilshere is still working his way back.
Having sold Pedro Obiang in the summer, fans were expecting another midfielder to arrive, but despite links to many of them, Manuel Pellegrini failed to bring one in.
West Ham have struggled in the middle of the park as a result, and a player like Radoja – a smart, combative midfielder with a fine passing range – would be a smart addition on a free transfer.
Premier League squad limits may leave West Ham struggling to complete a move until January unless Pellegrini can tinker with his squad, but he's worth bringing in and getting back up to speed after some time out of the game.
At Leeds, it's unclear just who he would displace, as he wouldn't be supplanting Kalvin Phillips right now, and with West Ham – who spent most of their budget on Sebastien Haller and Pablo Fornals – needing a cheap midfielder, the Hammers arguably need him more.
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