The trial will run until the end of October. The situation will then be reevaluated in six weeks.
Flamengo remain second in the group with six points from three matches but with a negative goal difference.
"Schalke is traditionally a strong brand and is said to have high earning power," Jobst said, adding the goal is to return to European competitions.
"It was important for Pierre-Emerick to stay with us. He's a superb player with an incredible mentality. Being the player to have taken the least amount of time to reach 50 goals with this club tells you everything you need to know about him and his way of working."
Just three minutes into the second half, Hamdallah doubled his team's lead and his own tally after tapping in a rebound that fell to him just outside the six yard box, after a magnificent solo run down the right by Khalid Al-Ghannam ended with his initial shot being deflected into the Moroccan's path.
The Gunners only finished eighth in the Premier League last season, but their FA Cup win secured them a place in the UEFA Europa League for the 2020-21 campaign. Enditem
BRATISLAVA, Sept. 18 (Xinhua) -- Slovan Bratislava's streak of bad luck in the European football competitions continues.
Palace took the lead in the seventh minute through Andros Townsend when Zaha stepped up to retake a harsh penalty given for handball. Although David de Gea saved Jordan Ayew's initial effort, he was adjudged to have moved too early, and Zaha netted the retaken kick.
World no. 9 Stephen Maguire only managed to draw twice and was beaten by Dale 3-1.
"My buddy, I always believe you, support you and love you," Beijing teammate and Chinese international Zhai Xiaochuan wrote.
Newcastle United also won away from home, defeating West Ham United 2-0 with goals from debutants Callum Wilson and Jeff Hendrick, and Crystal Palace made light of a lengthy injury list to beat Southampton 1-0 at Selhurst Park thanks to Wilfried Zaha's strike. Enditem