The Belgian then played a major role in the second goal in the 33rd minute, setting up Raheem Sterling, whose ball into space was put into the empty net from 10 yards by Phil Foden.
Players such as new arrival Gonzalo Paciencia are trying to spread optimism and are counting on football's unwritten laws.
Semedo has agreed to a three-year contract until the end of June 2023, with the option to extend it until 2025. He will replace Matt Doherty, who recently joined Tottenham.
Mendy will provide competition for Kepa Arrizabalaga, who is the most expensive keeper in the world after joining from Athletic Club in 2018.
The remaining eight teams of the league will form the other group, to be based in Dalian, to fight off relegation, with the last to be relegated and the second to last set to vie for a berth for the next CSL season with the winner of the second-tier league. Enditem
Jiangsu sealed the win just three minutes later as Xie Pengfei converted a free kick and into the box and the ball hit at his teammate Li Ang, which created a rebound for Martins to score a volley.
And all of this against a rival that in Gerard Moreno and Paco Alcacer has two of the best strikers in La Liga. Will it be a happy start for Koeman, or will he face problems from the very start?
The league debut comes after another difficult week, which followed a complicated summer in the wake of Barca's 8-2 thrashing to Bayern Munich in the Champions League. That defeat saw Quique Setien sacked as coach and replaced by Koeman and led to a clear out of the dressing room, which has so far seen Ivan Rakitic, Arturo Vidal, Arthur Melo, Nelson Semedo and Luis Suarez all leave the club.
DALIAN, China, Sept. 21 (Xinhua) -- Shenzhen FC dropped from the top-four of the Chinese Super League (CSL) Dalian division after losing to Shandong Luneng 2-1, while Shanghai Shenhua took Shenzhen's former position by drawing Jiangsu Suning 0-0 on Monday.
SUZHOU, China, Sept. 22 (Xinhua) -- Hebei China Fortune beat Tianjin Teda 1-0 in the 12th round of the Chinese Super League (CSL) here on Tuesday.
The first half saw fierce confrontation from both sides, as Hebei was eager to win a ticket to the championship game, while Tianjin had good morale from the latest match, and didn't want to lag behind.