Michael O’Connor has a signed a new deal which will keep him at Windsor Park until 2020.
The former Shamrock Rovers and Dundalk striker joined the Blues on a one-year deal in July.
Linfield manager David Healy said: “I’m delighted that we’ve reached agreement with Michael for him to sign a one-year extension to his existing contract.
“He’s loved every minute of being at Linfield and he’s proving to be a very good player.
“Michael’s strong and with an eye for goal and I know this news will go down very well with our supporters, who’ve taken to him already and who have been hugely impressed with his attitude and performances to date.
“I’m delighted that he’s shown his commitment to this club by readily extending his contract for at least another year.”