The Matt O’Riley rumour mill sprung back into life today after overnight reports indicated English Premier League side Southampton are keen on a deal for the Celtic star this summer. It’s been said that Celtic are bracing themselves for a bid in the region of £20m, with add-ons that would take the transfer into record-breaking territory for the Bhoys beyond £25m. However, any deal is not clear cut according to outlets local to Southampton. There’s still a lot of work to do to get anything over the line. The Daily Echo reported on Monday afternoon that O’Riley is looking for a larger salary tha…