Aston Villa utility player Chris Herd vowed to keep on improving after signing a new four-year contract with the club on Wednesday afternoon.

Herd had 18 months remaining of his current deal but has earned his new contract after impressing manager Alex McLeish, particularly since switching from right-back to central midfield.

The Australia Under-20 international told "I am really happy to have signed a new contract and I'm pleased that I'm going to be here for the next four years."

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