Sporting ended the game with 10 men when ex-Barcelona defender Jeremy Mathieu was shown a straight red card after fouling Pierre-Emerick Aubameyang, who was clean through, although the hosts could not find a winning goal.
Arsenal forward Welbeck was taken off on a stretcher and given oxygen in the 25th minute after landing awkwardly when jumping for a header only hours after being named in the England squad for their next internationals.
Welbeck was taken to hospital during the second half of the game for an x-ray.
Unai Emery made plenty of changes from the side that drew with Liverpool on Saturday evening with Welbeck among those recalled as the England worldwide replaced Alexandre Lacazette up front against the Portuguese giants tonight.
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Understandably, fans have been expressing their disappointment that Welbeck appears to have suffered yet another serious injury as his career at Arsenal has been blighted by a number of injury problems since he joined from Manchester United. "The news is that we are going to wait - but we think it's a serious injury". We wish him all the best in his recovery. He is a very good person, his commitment to us is very big. Danny was working well and...
"Lichtsteiner is muscular", he added. "We are following him every match and know he will help us in the future".
The Gunners' tie was enough to send the team to the knockout stages of the competition, joining Premier League rivals Chelsea.