Semi Ajayi (2nd R), training at Arsenal
Ajayi joined Cardiff from Arsenal in the summer of 2015 after initially impressing during a loan spell at the Welsh club.
The 23-year-old has yet to feature for Cardiff this season and Bluebirds boss Neil Warnock is happy to loan him out so that he can get regular first-team football under his belt.
The centre-back has enjoyed two loan spells away at AFC Wimbledon and Crewe Alexandra since joining Cardiff, with Ajayi unable to break into the first-team at the Cardiff City Stadium thus far.
Ajayi came up through the youth ranks at Charlton Athletic before joining Arsenal in 2013.
The Nigerian under-21 international never made a first-team appearance during his time at Arsenal, but he was an unused substitute for Arsene Wenger's side in Premier League games against Newcastle United, Stoke City and Hull City.
Rotherham are desperate to bolster their squad before the close of the transfer window and they have moved to take Ajayi on loan until the end of the season to help in their survival fight in the Championship.
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