Jenkins knows persuading the German club to sell the 22-year-old is another matter.
"He's done a great job for us and is still only young. Our aim is to keep our best players. We've always tried to do that over the years and it will be no different with Gylfi," he told BBC Radio Wales.
"The fact is when you take a player on loan, control is out of your hands. They (Hoffenheim) wouldn't commit to do a deal before we took him, which we would have loved to have done.
"But we've got to hope that his relationship now with the club, with the players and with Brendan has helped him in the Premier League, and he sees us as a great option next season if he's allowed to leave his club in Germany.
"No doubt there's going to be a bit of a battle on our hands to secure his services for next season. The other thing is they (Hoffenheim) have had a change of manager as well and he's still contracted there for a couple of years."