ALAMEDA, Calif. -- Through two preseason games in which hes played slightly more than two quarters, Raiders quarterback Derek Carrs numbers are downright bad.Carr is clearly not happy about it. To a certain extent, however, he also expected it.Entering his third NFL season and the second in offensive coordinator Bill Musgraves system, Carr is using the preseason to experiment with throws and plays that likely wont be used in the regular season.That might sound contrary to the normal theory of honing in on what works best in the preseason and tightening it up for when the games count.The Raiders, though, want Carr to embrace the opportunity to test the boundaries of his skills.Sometimes people are going to be mad at me for certain things in the preseason but (quarterbacks coach Todd Downing) always tells me its a great opportunity to see what you can get away with, Carr said Tuesday. I take that really to heart and do it.In seven drives with Carr at quarterback, the Raiders have scored two field goals, punted four times and had one end on an interception.While Carr has completed a modest 60 percent of his passes (12 of 20), he is averaging just 4.1 yards per pass attempt and has a quarterback rating of 48.3 that is by far the lowest among Oaklands three quarterbacks.On more than one occasion, Carr has forced throws into tight coverage. On others, he has put the ball up for grabs downfield while throwing off his back foot.Carrs longest completion in the two preseason games was a 22-yarder to wide receiver Michael Crabtree against the Arizona Cardinals.You know what it looks like when it looks good, Raiders coach Jack Del Rio said. We work on fundamentals a lot. We want to be able to block people, shed blocks, tackle, throw it and catch it ... some of the basic things that its really all about.Teams rarely reveal their regular-season strategies during the preseason. That figures to be the case more so this week when the Raiders host the Titans on Saturday night.Oakland and Tennessee also play each other in the regular season on Sept. 25.Both sides Im sure will hold a few things back, Del Rio said. Youre not going to show everything you want to do in the regular season in a preseason game.That means more experimenting from Carr.Its not a decision thats going to hurt us, Carr said Its a decision, if it works, its going to be a great thing for us. If we can continue to build on that, can it help us? Thats really all it is.I try not to do it too much but obviously I will do it during the preseason. Its a great opportunity and its a great time to do those things because when you hit Week 1 youre not going to try something new. Youre just going to do what youre supposed to do.Game notes Wide receiver Amari Cooper attended practice but did not participate. ... 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Maro Itoje will make his first start since October when Saracens face Bath on Saturday, after completing his recovery from a broken hand.The 22-year-old has missed Englands autumn Test series with the hand problem he suffered in Saracens 44-26 win over Scarlets on Oct. 22.But now World Rugbys breakthrough player of the year is fit for his comeback, boosting Saracens ranks ahead of this months two European Champions Cup rounds.Hosts Bath welcome back five internationals for the Aviva Premiership clash, with Wales Taulupe Faletau and England pair Dave Attwood and Semesa Rokoduguni leading the returning contingent.Rugby director Todd Blackadder hopes the influence of the returning Test stars can help the likes of fly-half Dan Bowden combat the sizeable threat of reigning European and Premiership champions Saracens.Its been great having the international guys available for the game, they give us a bit of extra experience in key positions, Blackadder said.Saracens are a good quality side and they are a team which performs no matter where they go, whether they are at hope or on the road.It is one of those games where there is a lot at stake for us and we want to perform.Weve picked Daniel (Bowden) because of his experience.He has been in the hot seat before. He has got to come on and be the kingpin decision-maker.South Africa wing JP Pietersen and Samoa prop Logovii Mulippola return to the Leicester squad to face Northampton at Welford Road, the duo back after international duty.ddddddddddddMike Fitzgerald has shaken off a knock to start in the back row, while Jono Kitto slots in at scrum-half.Pietersen and fit-again England centre Manu Tuilagi will offer the Tigers plenty of experience off the bench.Wales wing George North and France No. 8 Louis Picamoles go straight back into Northamptons starting XV after autumn Test duty.Ben Foden will captain the Saints from fullback for the east midlands derby, with JJ Hanrahan slotting in at inside centre for his first start of the season.Gloucester will field an unchanged starting XV for the third week in a row for the west-country derby clash with Bristol at Kingsholm.Scotland scrum-half Greig Laidlaw and Wales flanker Ross Moriarty take seats on the bench after completing autumn Test duties, as Gloucester gear up for their first match against Bristol in almost eight years.Acting head coach Mark Tainton has made four changes to his Bristol side, with Jack Wallace and Adrian Jarvis bedding in to the back line.Jason Woodward switches to full-back and Jack Tovey moves to outside centre.Rob Hawkins starts at hooker and Jon Fisher will partner Mark Sorenson at lock. 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