Celtic manager Ronny Deila insists Virgil van Dijk does not want to leave the Scottish Premiership leaders in January.
Celtic boss Ronny Deila says keeping his best players will take priority over acquisitions in the transfer window.
Marriott, 19, follows in the footsteps of Town left-back Aaron Cresswell after he put pen to paper on a new deal at Portman Road on Wednesday.
Marriott landed his first professional contract with the Suffolk outfit in the summer, a one-year deal which was due to expire at the end of the season.
But his form during a current loan spell at Skrill Premier side Woking, for whom he has netted six goals in five games, has already led to a new one-year extension.
"Obviously I'm delighted to have been offered a new contract," Marriott told the club's official website. "It's what I've been aiming for, to win a new deal and I couldn't be happier.
"I'm really enjoying my time on loan at Woking and I'm scoring a few goals.
"It's given me a boost in confidence. I feel I have improved as a player and with signing a new deal as well, things are going well for me. I've just got to keep working hard to make sure it stays that way."
Marriott has made one substitute first-team appearance for Ipswich to date, coming off the bench in a 2-0 defeat at Burnley in the final match of last season.