The duo this week put pen-to-paper on long-term deals with the club as the winter transfer window concluded.
Scott Wright’s arrival as a homegrown Scottish player allows for an additional player to be registered in European competition whilst Simpson replaces Brandon Barker in the Gers squad.
Gers qualified for the knockout stage impressively, as they won a four team UEFA group for the first time in the club’s history.
Standard Liege and Lech Poznan were defeated home and away, while highly creditable, back-to-back draws with Benfica ensured the Light Blues progressed unbeaten from Group D.
Antwerp are up next, and they currently sit second in the Belgian top league. The first leg is away from home on Thursday, 18 February with an 8pm UK-time kick-off.
That is followed a week later with the return match at Ibrox, with a 5:55pm kick-off.