Dejan's day started before 9am, when he arrived at the Club's training ground to be met by a number of his new teammates before heading in to meet with Mauricio Pochettino and the rest of the First Team management staff.
After speaking with his new boss, Lovren was shown around Staplewood by Club Captain Kelvin Davis before he was then fitted out for new adidas training gear by Saints' Kit & Equipment Manager Mark Forbes.
After a series of physical tests and a spot of lunch, Dejan set off for Southampton Solent University along with Nathaniel Clyne, who today returned from an extended summer break as a result of his involvement at the 2013 European Under-21 Championships.
The duo underwent a series of examinations before taking on the dreaded VO2 max test ahead of their full integration into the squad for regular training tomorrow morning.
Check out a gallery above, and there's exclusive video footage in the latest episode of Pre-Season Uncovered on our official YouTube channel