The world's top-ranked side controversially lost for the first time in almost two years at Wembley to slip from the summit in Group A2, but they returned to the top of the pile with victory on Thursday.

In the absence of Kevin De Bruyne following his injury last time out, Lukaku was predictably the star and netted either side of a Birkir Mar Saevarsson equaliser in the first half.

With England losing at home to Denmark, that brace proved enough for the Red Devils to reclaim control of the pool, surviving a slightly nervy stretch after half-time to condemn Iceland to relegation.

Lukaku quickly came to the fore and had the visitors in front after nine minutes, seizing on Hordur Magnusson's loose touch in the area and holding off Holmar Orn Eyjolfsson to slam a left-footed finish past Alex Runarsson.

But that lead lasted just eight minutes as Runar Mar Sigurjonsson's superb pass in behind Yannick Carrasco allowed Saevarsson to tuck in the equaliser.

Iceland pushed in search of a second, yet Eyjolfsson's rash lunge then saw Lukaku win a penalty for a second match running and, as against England, capitalise from 12 yards.

An entertaining first half gave way to a tense second and Belgium mustered only two attempts after the break but held on to deal Iceland a costly defeat.