Green has joined Pompey on a season-long loan from Villa, but is already set for time on the sidelines.
The youngster has undergone an operation on a cyst on his knee, through his own choice.
Green has carrying the injury for a long time, and the Villa man wanted it sorted.
But Jackett has suggested that Portsmouth were not aware of the problem when Green joined.
He said: “Obviously it has flared up, but there was no indication to us that this was going to be a problem through our medical.
“He had no confidence at present in his knee and wanted to try to get it out as early as possible, so we have to accept that. Nobody goes under the knife for no reason, we have to back him and back that decision.
“But it was a surprise to me, there was nothing in the very extensive medical we did or during conversations and talks with the player and the parent club. There was nothing that lent itself towards that being a risk for us when taking the player.”
Jackett was also surprised by Green’s own comments on the injury, with the Villa loanee admitting that the issue had been a long-term one.
“I did read that and felt it was a strange comment because if you are looking at his playing record it’s very good,” Jackett said.
“Usually you take a player on loan because they haven’t been playing, whereas Andre had been playing a very good standard and scored two goals in Germany in the summer after a full pre-season.
“I don’t think the injury influenced his two performances, I’ve spoken to him extensively about it and hasn’t mentioned the games for Portsmouth.”
Green has already played twice for Pompey since arriving from Villa, but not faces time on the sidelines.
Villa will hope that the winger is back sooner rather than later, as he was loaned out to gain some much needed first-team experience, which Steve Bruce just could not promise him.
Have something to tell us about this article?