Stafford-born Candlin initially joined Nuneaton on a short-term loan back in September before securing a longer stay a few months later.
Although he has found match minutes hard to come by as of late, Boro boss Jimmy Ginnelly paid tribute to the striker as he returns to WS1.
Speaking via his club's official website, Ginnelly said; "Mitchel is a great prospect and we would like to thank him for his efforts whilst here at the Boro."
