Days after Golden Boy Promotions CEO Oscar De La Hoya and HBO finalized plans for an attractive Dec. 19 doubleheader to close the year -- headlined by an even-money heavyweight fight between interim titlist Luis Ortiz and Bryant Jennings -- they beefed it up significantly on Thursday with the addition of two more fights that figure to be competitive and action-packed.

Joining Ortiz-Jennings and the junior lightweight co-feature between former featherweight titleholder Nicholas Walters and power puncher Jason Sosa will be a pair of 10-rounders: Gabriel Rosado (21-9, 13 KOs) against former welterweight titleholder Joshua Clottey (39-4, 22 KOs) in a middleweight fight (at a catch weight of 158 pounds) and light heavyweight contender Yunieski Gonzalez (16-1, 12 KOs) taking on up-and-comer Vyacheslav Shabranskyy (14-0, 12 KOs).

All four bouts will take place at the Turning Stone Casino Resort in Verona, New York, with Ortiz-Jennings and Walters-Sosa airing on HBO's "Boxing After Dark" series and Rosado-Clottey and Gonzalez-Shabranskyy preceding those two bouts on HBO Latino.

"We worked hard to put this card together and we're very happy with it," De La Hoya told ESPN.com. "Four really good fights on one card. It will be a great night to end the year with a bang."

Although Rosado, 29, of Philadelphia, is winless in his past five fights (0-4 with a no contest), each loss was to a quality opponent, including against Gennady Golovkin and Peter Quillin in world title fights and Jermell Charlo and David Lemieux, and he rarely fails to deliver action. During his losing streak he did record a non-official victory and draw on Big Knockout Boxing cards.

Clottey, 38, a native of Ghana based in New York, beat Zab Judah for a vacant welterweight belt in 2009 and then lost his next two fights, both world title bouts -- a close decision to Miguel Cotto and a one-sided decision loss in a passionless performance against Manny Pacquiao.

However, Clottey has won four fights in a row since the Pacquiao fight even though he has had long stretches of inactivity.

But he has fought twice in the past year and a half, including an impressive decision against former world titleholder Anthony Mundine in a junior middleweight bout on Mundine's turf in Australia in April 2014, and a near-shutout decision against Jorge Silva on May 9 on the Canelo Alvarez-James Kirkland undercard.

"Clottey is going up a little bit in weight and Rosado is going down a little bit in weight," De La Hoya said. "Besides it being a good fight, I think the winner will put himself back in line for an even bigger fight with any of the top junior middleweights or middleweights."

Gonzalez, 30, a Cuban defector fighting out of Miami, made a splash in July when he took former light heavyweight world champion Jean Pascal, the best opponent of his career by far, in his HBO debut. Although Gonzalez lost a close decision -- 96-94 on all three scorecards -- he gave Pascal hell in a barn burner that many thought Gonzalez clearly won.

Shabranskyy, 28, from Ukraine and living in Los Angeles, has won five fights in a row by knockout -- although he was knocked down twice in his last fight -- while stepping up in competition.

"Gonzalez and Pascal was a great fight and we saw what Gonzalez could do, so we know we're throwing Shabranskyy into the fire. But the winner will be knocking on the door to fight the best light heavyweights," De La Hoya said. "We promote Shabranskyy and, of course, I'm rooting for my guy, but this is a 50-50 fight."

De La Hoya worked with Star Boxing promoter Joe DeGuardia, who represents Clottey and Gonzalez, to make the bouts.

"It was pleasant to work with Joe and we're looking forward to doing lots more business with him in the future," De La Hoya said.

While De La Hoya is bullish on his fighters coming out on top, DeGuardia said he felt the same way about his guys, which is why he agreed to the matches.

"I like the fights for my guys and I like the card that it's on," he said. "It's a high-profile card and I have high hopes for Yunieski Gonzalez coming off the last fight because I thought he beat Pascal. A lot of people thought he beat Pascal.

"For Joshua, it will be a little higher weight than usual but I think it's the kind of card and kind of higher-profile fight that can put him in position to be where he has been -- in world title contention."