But after meeting Gatland, Toulon boss Bernard Laporte told newspaper L'Equipe: "We discussed the availability of Gethin Jenkins.
"We said again that we would not release him to leave with the Lions on 27 May if we are in the [Top 14] final. He understood. I think he already knew when he came to the meeting."
Toulon also said Wales' clash with Australia in Cardiff on 1 December fell outside the designated Test 'window' and Jenkins would not be available for that either. But this stance is backed up by IRB rules.
Lions in Australia 2013
Sat 1 June -
Barbarians, Hong Kong
Wed 5 June -
Western Force, Perth
Sat 8 June -
Queensland Reds, Brisbane
Tue 11 June -
Combined New South Wales-Queensland Country, Newcastle
Sat 15 June -
New South Wales Waratahs, Sydney
Tue 18 June -
ACT Brumbies, Canberra
Sat 22 June -
First Test, Brisbane
Tue 25 June -
Melbourne Rebels, Melbourne
Sat 29 June -
Second Test, Melbourne
Sat 6 July -
Third Test, Sydney
An IRB spokesman said on Monday: "The respective Unions are familiar with the policy regarding player release for the British and Irish Lions as outlined within IRB Regulation 9."
Only Lions contenders based in France appear to be under any threat of their clubs attempting to block them starting the tour.
BBC Sport Wales understands England's leading clubs will release players after their season ends at the Aviva Premiership final on Saturday, 25 May.
And those English Lions not involved in that final will be available to Gatland ahead of 27 May.
Welsh, Scottish and Irish-based players will also be fully available on the same basis as their English counterparts.
Jenkins and fellow potential 2013 Lions Mike Phillips (Bayonne), Jonny Wilkinson (Toulon), Luke Charteris (Perpignan) Lee Byrne (Clermont Auvergne) and James Hook (Perpignan) will battle throughout the season to win a place in France's Top 14 final.
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