Qatar's Almoez Ali was also sent off in the 78th minute, with Republic of Ireland able to hold on ahead of facing World Cup co-host Canada next Sunday. 

It took Heimir Hallgrimsson's side just five minutes to take the lead through captain Collins, who rose highest to brilliantly flick Moylan's teasing free-kick past Homam El Amin. 

The host side continued to dominate proceedings as Jason Molumby's shot from distance forced the Qatar goalkeeper into a comfortable stop, though they found themselves a man down on the stroke of half-time. 

After scoring a hat-trick on his debut for his country and getting an assist here, Moylan was handed a straight red card following a clumsy challenge on Jassem Gaber in midfield. 

Despite having an extra man, Qatar struggled to test Caoimhin Kelleher, though the Brentford goalkeeper had to be alert to deny Yusuf Abdurisag's 71st-minute shot, which deflected off Collins before being pushed behind. 

Qatar's hopes of a comeback were dented when Ali raised his hands and pushed Molumby to the floor, and the Republic of Ireland could have added a second late on, but Collins' header across goal just evaded the heads of James Abankwah and Troy Parrott.