R. Standard de Liège striker Milan Jovanović was impressed by the way his team's UEFA Europa League opponents, Panathinaikos FC, progressed to the round of 16. The Greek club stunned AS Roma two weeks ago in their round of 32 second leg by scoring three times in six minutes before half-time on their way to a 6-4 aggregate success. "I expect a very difficult game," said the 28-year-old. "Panathinaikos are a very strong side. I watched large parts of their games against AS Roma and saw lots of qualities in the team, both collectively and individually."