That latter belt came with a second-round win over former European super-featherweight champion Tontcho Tontchev, who last week knocked out
Dean Phillips in the first round.
He was knocked out
by Moses Pedroza in only his fifth contest and his challenge to then IBF title holder Manuel Medina six years ago was halted following cuts due to a clash of heads six years ago.
Sinclair, who is hoping to get a World title chance, knocked out
Roche with a fierce body shot and said afterwards: "I don't want to get carried away.
Then they decided the possibility of getting knocked out
of this Champions League was too big a financial risk.
He will move up to middleweight and it will be his first fight since being knocked out
by Jamie Moore earlier this year.