Interestingly there's no release clause in his contract, but there is the option to extend by a year. (squawka.com)
If true, then the biggest obstacle in all of this will presumably be his release clause. (caughtoffside.com)
Aubameyang has a contract with the club until 2018 but there is a release clause of just over # 6m which has re-ignited Alan Pardew's interest. (express.co.uk)