He has been in regular contact with Howley and Wales' coaching team since his accident.
"I can assure you I am going to be right in a few weeks and be up and running around," Gatland told BBC Wales' Scrum V programme.
"At this stage, I'll probably struggle to make Brisbane for the first Test. If I can be in Melbourne and Sydney for the second and third Tests, that will be great.
"As much as anything, just to go and have a little bit of an input, really, to support the coaches and players as much as anything.'
"I've spoken to the Lions, obviously. I think they are just waiting to have assurances that the injury is going to heal, that it's not going to be a hindrance in 12 months."
Wales play the Barbarians in Cardiff this weekend, when flanker Martyn Williams is expected to win his 100th cap.