A police statement said plans were in place to attack Saturday's match in Albania, and at the same time attack another target in Kosovo.
Nineteen people were detained in Kosovo on November 4, of whom one has since been released, police there said. Albania and Macedonia announced six more people detained.
The Kosovo police said that at the suspects' homes and premises officers found explosive devices, weapons and electronic equipment, including "religious material and literature from well-known authors recognized for their extremist ideology."
The venue of the qualifier was changed for "security reasons" from the northern city of Shkoder, near the border with Montenegro, to Elbasan, much nearer to the capital Tirana. Israel won the match 3-0.
Both Kosovo and Albanian authorities claim that no more of their citizens have joined the rebel groups in Syria and Iraq over the past year, but scores of them remain active with IS fighting groups.
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