Carlos Sainz admits Toro Rosso could struggle during the second half of the season as a result of running a 2015 Formula One engine that is no longer being developed.Toro Rosso switched from Renault to Ferrari engines ahead of this season, but the lateness of the deal meant the team had to use a 2015-spec power unit in order to avoid having to build a brand new chassis at the last minute to accommodate a 2016 engine.As a result, the Faenza-based outfit has slowly been dropping down the pecking order as rival teams have continued to develop their own engines. Sainz says he is under no illusions of how much of a challenge the rest of 2016 could prove to be.Unfortunately now every race will be tricky, he said. Budapest should have been our strongest track and we were definitely struggling to be ahead of the midfield. It will be a tough season for us now.Its no secret that weve been falling back since Australia when we were P5 or P7 in quali, to now that we really struggle to make it to Q3. Its no secret the steps that Force India and McLaren have made are making it more difficult to go through.I think we know more or less where we are going to spend the rest of the season, obviously we are keeping a close eye on what McLaren and Force India are doing, but our position should always be between the fourth and seventh teams, depending on the track.Despite a disappointing German Grand Prix in which Sainz and teammate Daniil Kvyat struggled for pace, the Spaniard is happy with the job Toro Rosso has done considering the engine disadvantage.We are compensating with good strategies and good pit stops, good race performances, we more or less compensate the lack of development. 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GREEN BAY, Wis. -- As the Green Bay Packers went back to work Tuesday after an extended break, they started to prepare for a big matchup with a diminished secondary.Coach Mike McCarthy announced Tuesday that cornerback Damarious Randall, who had been sidelined with a groin injury, underwent surgery and is out this week.The timing couldnt be any worse with the NFC South-leading Atlanta Falcons and their potent passing attack, led by quarterback Matt Ryan and playmaking receiver Julio Jones, up next.Thats just the way things go, Packers cornerback Demetri Goodson said. If you look at every single team in the league, theyre beat up from top to bottom. So thats just the way it goes.The Packers must try to slow down Jones without their top two and possibly top three cornerbacks from the start of the season.Veteran Sam Shields is on injured reserve after not playing since the Sept. 11 season opener, when he suffered a concussion.Randall didnt play Green Bays most recent game, a win over the Chicago Bears on Thursday night, after he reinjured his groin four days earlier.A similar injury has kept Quinten Rollins from playing the past two games.Rollins status is up in the air for Sundays game at Atlanta.The second-year pro said Tuesday that although he feels a sense of urgency to get back on the field and bolster Green Bays depleted depth at cornerback, he wants to avoid risking further injury.Obviously, you want to go out and compete against the best, but at the same time, you cant let who youre playing dictate your body or how you feel, Rollins said.Minus Rollins, that would probably mean a second straight game for the young tandem of LaDarius Gunter and Demetri Goodson as well as versatile fourth-year player Micah Hyde as the teams primary cornerbacks.Green Bay also has played undraftted rookie Josh Hawkins.dddddddddddd And the Packers added another player to their banged-up secondary by promoting first-year safety Jermaine Whitehead from the practice squad Monday.Goodson said hes preparing this week as though Rollins wont play against the Falcons.If he does, great, Goodson said. But if not, then well definitely be ready.And as Goodson sees it, more than one player is going to be needed for the Packers to have success against the talented Jones, who leads the NFL with 830 receiving yards in just seven games.Jones had 11 catches for 259 yards and a touchdown when the Packers last played Atlanta in 2014, a 43-37 Green Bay win at Lambeau Field.With a guy like him, theres not one guy that you can just put on him and just shut him down, Goodson said. Its going to be definitely a team game to try to stop him because hes a great player.Mixing strength and speed with tremendous size, the 6-foot-3, 220-pound Jones also ranks No. 1 in the league with an average of 20.8 yards per catch and 16 receptions of 20 or more yards.The Packers have allowed 21 completions of at least 20 yards in their six games.Julio is just a freak of nature on film, defensive end/linebacker Datone Jones said. Hes a beast.NOTE: RB Don Jackson hopes to get back on the field later this week. The undrafted rookie suffered an injury to his left hand in the first half of his debut Thursday. He wore a therapeutic glove on the hand Tuesday, saying he still had some swelling, but that tests didnt reveal a fracture. They gave me this glove so I could calm it down, and its already looking better, Jackson said.---Online:AP NFL website: www.pro32.ap.org and www.twitter.com/AP-NFL ' ' '