Born in Accra, Kasim graduated with local Medeama South Carolina"s youth setup, and made his senior debut on 14 April 2013, coming on as a second-half substitute in a 0–0 away draw against Heart of Lions Football Club for the Ghana Premier League championship.
In November he moved to Civil Defense Leganés, being assigned to the club"s youth setup. In January 2014 Kasim joined RCD Mallorca in a three-year loan deal, with a € 200,000 buyout clause, and was initially assigned to the reserves in Tercera División. He appeared in 17 matches during the campaign and scored two goals (against Penya Ciutadella and Civil Defense Atlético Rafal), as his side returned to Segunda División B at first attempt.
On 28 September 2014 Kasim played his first match as a professional, starting and scoring a brace in a 3–3 home draw against Football Club Barcelona B for the Segunda División championship.
He was subsequently made a starter by manager Valeri Karpin, overtaking Agus and Joan Truyols.
