Mark Warburton has backed Niko Kranjcar to return fitter and stronger after surgeons reported the Rangers playmakers knee surgery had been a success. The Croatia international midfielder ruptured his cruciate ligament last month in a freak training ground accident and was ruled out for the remainder of the season.Rangers boss Warburton accepts the 32-year-old faces a lengthy rehabilitation period, but is hopeful Kranjcar will make a full recovery. The Englishman told Rangers website: Nikos operation went well, the stitches came out on Monday, which he is pleased about and the inflammation is down.He is going through the normal four weeks [recovery period] and then after four weeks he will revisit the surgeon and hopefully get the green light to push on from there.It is a really structured week-by-week programme, there is no cutting corners and unfortunately it is a very common injury in football now but the programme is set. Kranjcar was injured in a training ground accident It is a week-by-week programme and you cant be doing well at four weeks and jump ahead to eight, it doesnt work that way, you have to go step after step.He is in great hands and his attitude is first class and we have no doubt he will return back fitter and stronger than ever.Warburton has also been left frustrated after seeing promising midfielder Jordan Rossiter suffer another a setback in his fight for fitness.The 19-year-old Liverpudlian is nursing a calf injury, having not played since late August when he hobbled off against Kilmarnock. Six months half price Upgrade to Sky Sports now to watch Man U v Arsenal on Saturday and get the first 6 months half price Jordan is getting there, he had a small setback and there is a lot of work being done with him, said Warburton.Jordan is a boy who just wants to play football. His ability is more than evident to anyone who has seen him play this season.The frustration is obvious, but hes working hard and these things happen, these frustrations come with the game.Jordan is very frustrated at the moment, but there is no doubt his quality is there and well see it sooner rather than later Im sure. Rangers midfielder Jordan Rossiter is still out of action with a calf problem Meanwhile, Warburton has sent first-teamers Philippe Senderos, Danny Wilson, Matt Crooks, Martyn Waghorn and Barrie McKay north with the Light Blues U20s side for Tuesdays development league clash with Ross County.Centre-backs Senderos and Wilson are making their way back from injury and Warburton wants the rest of the group to pick up some valuable action ahead of Saturdays Ibrox clash with Dundee.Warburton said: We had a decent session on Monday and four or five of the boys will be involved in the U20s game on Tuesday at Ross County.That is good for them and means they can get some pitch time after the break, that has worked out well for us and they have a good playing surface up there. Philippe Senderos will be in action for the U20 side on Tuesday We will probably look to involve Philippe and Danny from a defensive point of view, Matt Crooks and Barrie McKay will get some pitch time and Waggy will play too.Waggy, all credit to him, was keen to play in the last 20s game, but it was an artificial surface and we were hesitant.They are putting four or five first-teamers out as well, so hopefully it will be a good test and they will look forward to that.We were down to two centre-halves and all credit to the medical and performance guys for working so hard and to the boys for putting the effort in.They boys are back and training with us and they need minutes now, at the moment Clint and Rob have the jerseys but it is about being ready when your chance comes along.Upgrade to Sky Sports now to watch Man Utd v Arsenal this Saturday and get the first six months half price! Also See: ONeill rules out Scotland Barton leaves Rangers United face Queens Get a £10 free bet! 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Aside from the trilogy main event title fight, there are a number of intriguing matchups in the heavyweight, welterweight and lightweight divisions.Michael van Gerwen issued an inhospitable welcome to BDO legend Martin ‘Wolfie’ Adams at the Grand Slam of Darts, beating him 5-2 on Saturday night. Van Gerwen, the PDCs top dog, controlled the tie throughout and looked bitterly disappointed to have even conceded two legs to Adams, who was making his second consecutive appearance at the Wolverhampton tournament.Adams was left laughing in bemusement at Van Gerwens quality as the Dutchman took out 106 for the opening leg. Adams was able to briefly trouble the scoreboard - much to the delight of the crowd who celebrated him with wolf cries - but it was a brief moment of fun for the veteran. Afternoon session results Barney, Snakebite, Wade off to perfect starts Michael van Gerwen was disappointed in his performance Van Gerwen closed the show to top Group A alongside Brendan Dolan who beat Max Hopp 5-4.Scott Mitchell secured the BDOs most notable result of the opening day with a 5-1 thrashing of Adrian Lewis.Mitchell twice checked out on the bullseye to join Benito van de Pas, who beat Chris Dobey 5-4, at the top of Group H.Gary Anderson overcame a major obstacle in the BDOs No 1 representative, Glen Durrant, to cling onto a 5-4 win. Heres Gary Andersons winning darts The PDC world champion, wearing the glasses that have become a feature of his recent look, edged through a back-and-forth match in which every leg went with the thrower.Durrant brilliantly held his throw under pressure for 3-3 but then missed a dart to break, and his hopes of a shock result went with it. Gary Anderson reacts to beating Glen Durrant Anderson, 4-3 up, missed a dart for the match but he held his next throw to go top of Group E alongside Nathan Derry, who beat Alan Norris 5-4.ddddddddddddPhil The Power Taylor made short work of Darryl Fitton, winning 5-1 and casting an ominous sign as to how some of the BDO contingent might cope on this stage. Phil Taylors winning salvo Taylor roared into a four-leg victory without Fitton ever threatening a checkout, until the six-time Grand Slam champion wastefully gave away the fifth by missing a match dart.It was a brief reprieve and Taylor swiftly shot to the top of Group D - he was joined by Ian White who wrapped up a 5-3 win against Darren Webster. Phil Taylor reacts to beating Darryl Fitton 5-1 Evening resultsBrendan Dolan 5-4 Max Hopp (A)Alan Norris 4-5 Nathan Derry (E)Ian White 5-3 Darren Webster (D)Benito van de Pas 5-4 Chris Dobey (H)Phil Taylor 5-1 Darryl Fitton (D)Gary Anderson 5-4 Glen Durrant (E)Michael van Gerwen 5-2 Martin Adams (A)Adrian Lewis 1-5 Scott Mitchell (H) Also See: Sky Bets darts odds On Sky TV Schedule/Results Features Get Sky Sports ' ' '