Ya zira kwallaye na biyu na yakin neman zabe, inda ya zira kwallaye biyu ga West Brom a nasarar da suka yi a gida da Sunderland a ranar 23 ga Fabrairu. A ranar 9 ga Maris, a wasan gasar da suka yi da Swansea City, Lukaku ya zira kwallaye na daidaitawa kafin a sami bugun fanareti; West Brom daga karshe ta lashe wasan ta hanyar Jonathan de Guzmán. A ranar 19 ga Mayu, ya shigo a matsayin mai maye gurbin rabi na biyu, Lukaku ya zira kwallo mai ban mamaki a rabi na biyu, yayin da West Brom ya dawo daga kwallaye uku don yin wasa 5<unk>5 a wasan karshe na gida da Manchester United. Wasan shi ne na 1,500 da na karshe na Alex Ferguson a matsayin United, kuma mafi yawan cin kwallaye a tarihin Premier League. Duk da cewa kulob din ya ba da shi aro, Lukaku ya zarce dukkan abokan wasansa na Chelsea a Premier League a wannan kakar, kasancewar shi ne dan wasa na shida mafi yawan kwallaye a kakar 2012-13 tare da kwallaye 17. Lukaku ya buga wasanni biyu na Premier League don Chelsea a farkon kakar 2013-14. Ya kuma zo a matsayin mai maye gurbin a cikin
2013 UEFA Super Cup, a ƙarshe ya rasa hukuncin yanke hukunci a cikin harbi yayin da Manuel Neuer ya ceci harbinsa kuma Chelsea ta yi rashin nasara a hannun Bayern Munich.