The Ecuador international is available on a free transfer after his contract at Villa Park expired over the summer.
He is now training with The Royals and he could earn himself a move to The Madejski Stadium.
De la Cruz, with four years' Premiership experience under his belt, could be an attractive option to Reading boss Steve Coppell.
Coppell has found his summer recruitment plans limited to just Seol Ki-hyeon and Sam Sodje.
Sky Sports