The former Racing Club playmaker also revealed the reason for his move to La Liga.
This week saw Koeman's men beat Girona 3-1 in another preparation game, but Saturday will be their last chance to get things right before things are for real next week.
The Foals responded but neither Stefan Lainer nor Lars Stindl was able to overcome Burki before the half-time whistle.
Sharjah's chances of progressing to the next round now hang on their ability to collect three points in the reverse fixture on Friday.
Dalian ended the impasse in the 33rd minute when Swedish winger Sam Larsson assisted Salomon Rondon to net a stunning long-range strike.
Serginho then turned from hero to villain when he received a second yellow card for scything down Carlos Eduardo two minutes from time.
Frank Lampard's expensively assembled Chelsea side also began the new season with three points, winning 3-1 away at Brighton & Hove Albion in the Monday evening kick-off.
Kuopio's Nigerian striker Aniekpeno Udoh got in front of Bratislava's goalkeeper Greif and had no trouble scoring from close range after a low pass from the right side.
Five minutes later, the crossbar denied Dortmund a greater lead before the break, as Jadon Sancho's header bounced off the woodwork.
However, the top Shenzhen scorer was substituted with a suspected groin strain in the 43rd minute.
Hebei tied the game in the 98th minute when the referee awarded them a penalty after reviewing VAR. Marcao then converted it to complete a dramatic comeback. Enditem