The 26-year-old midfielder powered the Blues to victory after converting a close-range chance from Willian's cross in the 63rd minute of the encounter at the King Power Stadium.
Erik ten Hag had pushed to get the deal done imminently, with the Dutchman seeing the 24-year-old as a priority signing alongside finding a new striker, with Tottenham's Harry Kane being a leading target.
Timo Werner has gone 12 matches without finding the net while the £70m signing Kai Havertz has been in and out of the side and has been way below his best.
The Senegal international is yet to establish himself as the man to help solve the Blues' scoring woes. Pochettino's side have continued their trend from recent years of dominating matches in terms of chances but not finding the net.
Les Blues responded immediately, with Kylian Mbappe finding Karim Benzema, who curled in an unstoppable effort With 10 minutes left in the game, Mbappe broke free to score the winner. "We showed our character against a very strong team.
It seems to be a matter of finding a buyer for (Nikola) Kalinic," Balague told BBC Radio 5 live. "Everything else seems to be in place for Morata to abandon what feels like a nightmare."
Cech announced earlier this year that he was retiring at the end of the season with his final appearance for Arsenal coming in the Europa League final defeat to the Blues.
Chelsea manager, Frank Lampard has singled out young defender, Fikayo Tomori for special praise despite Blues 2-1 loss to Liverpool in the Premier League on Sunday.
According to the Leicester City boss, Thomas Tuchel's experience of working with world-class players has helped the Blues' transformation after Lampard's sack.