But after using a new radiowave treatment device from Spain, Jenkins is making a rapid recovery in a bid to face the All Blacks. Jenkins, 28, said: "I've been told I can be back playing in 12 weeks and if that is the case I could be back by October 17.
"Usually shoulder surgery means four weeks of doing nothing at all and waiting for things to settle down. The idea of that was really frustrating so when the surgeon suggested this treatment I went for it straightaway.
"It's hard to feel what it is doing but hopefully the benefits will come through weeks down the line. When you come back from something like this it plays on your mind when you get back on the field. But you have to get over that and get on with it.
"But I hope to be fit in time for the autumn games - that's definitely the aim."
The revolutionary Tecar system is also used by Premier League giants Chelsea and tennis superstar Rafael Nadal. And Wales coach Warren Gatland will be delighted the therapy is also having the desired effect on fellow Lions star Martyn Williams.
Williams was carrying a shoulder problem before the third Test win in Johannesburg. But thanks to the treatment, the flanker is now in contention to take on the southern hemisphere quartet of New Zealand, Samoa, Argentina and Australia.
Williams said: "I've never had surgery before but I hope this will make a difference and help put me in contention to feature in the autumn."