Pennant has only made two appearances for the Potters this term but joins a side hoping to bolster their attacking options after losing Slawomir Peszko, Razak Boukari and Stephen Hunt to injuries. And Henry, while reflecting on his side's impressive start to the season, believes the addition of the 29-year-old will prove crucial ahead of Saturday's trip to Huddersfield.
"In terms of Jermaine, I remember being in the England Under-21 squad with him a fair few years ago and everybody knows he is a quality player," said Henry.
"Having lost three wide players to injury it was clear we needed to bring someone in and I think he will prove a very good addition.
"He has a lot of experience and having not played too much recently I am sure he will want to show what he can do.
"The more quality players we have at the club the more chance we have of being successful and hopefully Jermaine can help us continue our good start to the season.
"I have said from day one that it always takes time with a new regime for management and players to sing from the same hymn sheet and there were a lot of changes to the squad in the summer.
"We are certainly getting there and we all understand what the manager wants from us. There is still more to go in terms of improvement but it is a promising start."