Grimsby extend loan duo's stay
By Mark Buckingham
Last Updated: 01/01/70 1:00am
The pair have already spent a month at Blundell Park and have impressed with the First Division strugglers.
Oster returned to his former stamping ground from Sunderland and has scored two goals in five appearances.
Middlesbrough defender Gavin has also had five outings for The Mariners as the Irishman enjoys regular first team football.
Both players will stay at the club until the advent of January, although Gavin will not be permitted to play in the FA Cup as Middlesbrough do not want him cup-tied.
Meanwhile, Grimsby have wrapped up the signing of midfielder George Santos after his previous short-term deal expired.