Captain Alexandra Popp announced her retirement from the Germany national team on Monday, citing a “gut” decision. The 33-year-old, who has played in 144 international matches and scored 67 goals, will say goodbye in a friendly with Australia in Duisburg on October 28. “I was lucky and honoured to wear the Germany jersey with pride for a total of 18 years, including almost 14 and a half years in the senior team,” Popp said in a statement. “I always emphasised that my gut would make the decision, and now it has. After long, tearful deliberations, I have decided with a heavy heart to end my nati…