The Gunners eventually ran out 4-3 winners following an entertaining encounter at the Emirates Stadium.
If Sanchez was looking for reasons to be optimistic about staying watching his team-mates go 2-1 down at home in their opener was not going to be one of them. He wants to tackle.
However, what Arsenal must avoid is becoming too complacent with the result.
"I'm happy we handled it well in the end", said Cech, who joined the Gunners from Chelsea in 2015.
A lot has changed since these two sides last met in April when Arsenal snatched a late slim 1-0 win gifted the Gunners courtesy of an own goal by Robert Huth.
'Tonight we needed this win, everyone knows the importance of the first game for confidence. That's acceptable but perhaps proved that Arsenal's second-string defenders may not be as good as we thought. "They're good glimpses of what you're going to get from them this season".
Here he picks his Premier League teams to beat, bolter to watch out for and the clubs set for relegation.
"Now with the emergence of Dele Alli and Harry Kane, there's no denying the quality of Spurs' players", said Lampard.
"I think he had in his career some bad moments because he had some small injuries", the manager added. He's such an important player. "Without him you might be fourth or fifth, but without him you might be challenging [for the title]". A hard call to say who'll come out on top before the transfer window closes but, with rumblings of discontent at Stamford Bridge, I'll go for United, who look a little more solid defensively than their neighbours.
But the home side's pressure in the final half hour turned the game back their way and Ramsey equalised with a shot from close range seven minutes from time with Ozil appearing to handle the ball in the build-up. Yes, they looked shaky at times in defense with Lacazette and Welbeck combining well in and around the box, but most teams struggle with that against Arsenal.