The club today confirmed that former West Ham goalkeeper Adrian would be arriving as a replacement for goalkeeper Simon Mignolet to deputise for Alisson Becker if required.
Otherwise, 17-year-old centre-back Sepp van den Berg and 16-year-old Fulham winger Harvey Elliott are the only other players to have arrived at Anfield over the summer as Jurgen Klopp has looked to safeguard the future while remaining content with what he has got in his first team squad.
And that situation does not look set to change before the window closes on Thursday.
But Henderson insists that having invested so successfully ahead of the last campaign, if Klopp feels he does not need to strengthen then fans should back his judgment.
“If the manager hasn’t signed anyone then he knows better than everyone else, for me,” he said. “We believe we’ve got a strong group in the changing room, a strong team, and we’ve just got to keep learning, keep improving on the training pitch, keep doing what we’ve been doing for a long time now, and keep staying hungry for more success.
“I think we’ve got a fantastic squad of players, we’ve showed that. We can use everybody, we’ve got big players coming back from long-term injuries, which is like new signings as the manager says.”
Liverpool were only a point behind Manchester City last season and lost to them on penalties in Sunday’s FA Community Shield at Wembley.
Henderson, though, feels there is plenty of scope for improvement.
“We can’t always think back to what we did last season,” he said. “We’re looking forward, we want to improve as a team.
“There were a lot of games last year where we didn’t play particularly well and play as well as we like and we did grind results out at times.
“Performance-wise, we can be much better and that’s what we’ve got to focus on.
“Against City, in the second half it did improve. We’ll be disappointed with the first half but second half was more like us.
“Mo Salah created some really good chances to score and was a little bit unlucky not to score the header at the end.
“So it was really positive stuff and we take that going into the game against Norwich on Friday.”