Both Ullman, 26, and Lindquist, 30, have played in the HockeyAllsvenskan recently, Sweden's second-highest league. Both will now join Martigny for the upcoming season.
Erik Ullman played for HC Vita Hästen last season and worked there with HCV Martigny's new head coach Anders Olsson. In a total of 51 games, he recorded 29 points (eight goals).
David Lindquist, for his part, suited up for BIK Karlskoga for the past three seasons. Last season, he put up 36 points (14 goals) in 56 games.