The Englishman arrives following a career revival on the south coast, but built a name for himself first after coming through Manchester United's academy and then during a five-year stint with Arsenal.
Advertisement
Advertisement
Signing Welbeck represents a shift in transfer strategy from the Blues, who are looking to add more experience under new manager Xabi Alonso.
The 35-year-old has featured 400 times in the Premier League, scoring 90 goals and registering 38 assists.
The club are also close to completing the signing of 36-year-old Jordan Henderson.