The two sides meet again on the same ground on Thursday.
The Israeli club scored the opening goal in a clever team execution of a free kick from 20 meters in the 30th minute. Instead of shooting on goal, Dutch midfielder Tjaronn Chery produced an impressive pass to Australian striker Nikita Rukavytsya, who passed to midfielder Yuval Ashkenazi for an easy goal.
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Despite pundits predicting Schalke to be among the relegation candidates, Raman is convinced, "we won't get into trouble this time. The squad has learned its lesson," he said.
Moises Caicedo put the hosts ahead with a 40th-minute strike at La Casa Blanca in Quito, more than 2,800m above sea level.
"Our players are highly motivated to beat their opponents on Sunday. We are Esteghlal and can benefit from our previous experience in the competition," he added.
"Thanks to my strategy -- following the leader at first, taking the opportunity when chance appeared. I ran men's 10,000m race on Wednesday, it helped me to heat it up," said 24-year-old Peng.
Raul Jimenez put the away side in front with a half-volley from Castelo Podence's left-wing cross, before Romain Saiss's header from Neto's corner completed the scoring.
In the other game played on Wednesday in the Suzhou division, Tianjin Teda held a 1-1 draw with Shijiazhuang Ever Bright. Frank Acheampong's header put Teda ahead in the 70th minute, but Chen Pu helped Shijiazhung level up in nine minutes.
The idea to add some leadership skills to exiting teenage talents could well pay off if the Swiss coach can create stability.
Koeman also insisted he had a good relationship with Lionel Messi, after the striker had told the club he wanted to leave, only to later say he would stay in order to avoid lengthy legal wrangling.