Mullins said talking to Oxford's official website: “I had a great time when I was here last year, so I’m looking forward to pulling on the yellow shirt again. Having fought so hard to get Rotherham up last season, I wasn’t planning on playing in League 2 again. However, I believe that this time next year Oxford will be a League 1 side anyway and I’m looking forward hugely to helping make that happen and then moving onwards and upwards with the club from there.“I enjoy the style of football that Oxford play and the kind of club this is. Even compared to last season, the club has made tremendous strides behind the scenes and everything here is geared towards promotion.” Millers boss Steve Evans added his views from the NYS. telling themillers.co.uk: "From the players point of view the three-year contract offered was good for him and his young family. "Johnny is a top professional and an excellent player but with the form from the likes of Kari Arnason, Craig Morgan and Claude Davis we could not guarantee him a place on a regular basis."