Norwich boss Peter Grant has completed the double signing of midfielders Simon Lappin and Mark Fotheringham.
Lappin, Sutton and Kirk Broadfoot celebrate for St Mirren
Former Scotland under-21 international Lappin has joined the Canaries from St Mirren for £100,000, while Fotheringham recently left Swiss side Aarhau.
Buddies chairman Stewart Gilmour had hoped to convince Lappin to stay at the club, but the 24-year-old has signed a two-and-a-half year deal at Norwich.
Fotheringham, meanwhile, has signed until the end of the season.
St Mirren appear to have already compensated for the loss of Lappin by signing wing-back Eddie Malone and midfielder Stephen O'Donnell from Clyde.
But Gilmour has rejected reports that striker John Sutton was also about to leave St Mirren Park, with Scottish Premier League rivals about to sign him on a pre-contract agreement.
There is no truth in the story that John Sutton has signed, or was about to sign, an agreement with Falkirk
St Mirren chairman Stewart Gilmour
"I spoke to John Sutton's agent, Tony McGill, and Tony is delighted to be quoted that there has been no contact whatsoever from Falkirk," said Gilmour.
"So there is no truth in the story that John has signed, or was about to sign, an agreement with Falkirk.
"There is absolutely no truth whatsoever in the reports as there has been no contact from Falkirk to the club, John or his agent."
Sutton is out of contract in the summer and Buddies boss Gus MacPherson has refused to be rushed into discussing a new deal until next season's budget becomes clearer.
But Gilmour said: "John and Tony are coming in to see Gus and ourselves for a meeting which has been arranged for early February.
"We'll all sit down then and have a look at John's future plans."
Meanwhile, former Dundee, Hibernian and Partick Thistle manager Jim Duffy is at Carrow Road discussing the possibility of joining the Norwich coaching staff.