Isco's move to "Union" may not happen © AP

Isco's transfer to Berlin's "Union" could collapse.

Although on Tuesday morning it was announced that an agreement had been reached, the 30-year-old Spaniard encountered problems during the medical check-up.

"The situation has changed somewhat today," - commented the footballer's representative on the situation.

It is not yet clear whether both sides will reach an agreement on new contract terms.