"I'm very pleased because it's always nice to win awards," said Koeman, who fended off competition from Manchester City counterpart Manuel Pellegrini, Tottenham Hotspur's Mauricio Pochettino and West Ham United's Slaven Bilic.
"It's of course a personal prize but it's great for the whole technical staff, all the players, the people in the club and the fans that we win again."
Aguero also wins the award for the third time in his career, after scoring five of City's eight Premier League goals in January and registering one assist as City took eight league points out of a possible 12.
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
(Reporting by Simon Jennings in Bengaluru; Editing by John O'Brien)
