The Mirror reports that West Brom boss Roberto Di Matteo is ready to let the England Under-21 international leave on loan.
Mattock is currently recovering from a thigh injury.
The 20-year-old is behind Nicky Shorey and Marek Cech in the pecking order at West Brom.
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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.