Henderson, who helped England to a fourth-placed finish at the World Cup, impressed his manager with his fitness levels and played 20 minutes in Tuesday's 3-1 pre-season win over Torino.
New goalkeeper Alisson started for Liverpool, before Loris Karius was given a rousing reception when he replaced the Brazilian in the second half, just over two months after suffering concussion and making two terrible errors in the Champions League final defeat by Real Madrid.
But while City begin the campaign as firm favourites after their record-breaking title campaign last season, they will be well aware of the threat posed by Juergen Klopp's improving Liverpool and the rest of the big six. But the 21-year-old missed the match with a tight muscle and is a doubt for the weekend.
Liverpool, however, beat City three times last season - twice in the two-legged Champions League quarter-final, and their moves in the transfer market should make them serious contenders.
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The same three players were involved in the opener.
Fabinho, who had scored 16 in a row from the spot for AS Monaco, sent the penalty several yards wide. Wijnaldum and Salah combined to set up Firmino for a shot that deflected into the top corner off Lorenzo De Silvestri.
Klopp swapped seven of his starting lineup at half time and the intensity of Liverpool's second-half performance inevitably suffered. Torino with their former defender Matteo Darmian looking on from the main stand‚ pulled a goal back through Andrea Belotti's fine header. "But I'm happy we can start at the weekend because preseason is good but the season is better still".