Sunderland have been training today, as they start their preparations for the 2015-16 campaign.
One of the players who was working hard during today’s pre-season training with defender Adam Matthews (see photos above, below and to the right)
Matthews played for Celtic for four years after moving to the Glasgow giants from Welsh outfit Cardiff City in the summer of 2011.
During his time at Celtic Park, the Welshman won the league title four times and established himself as one of the better players in Scotland.
Matthews will now be determined to show his quality in the Premier League and take his game to the next level.