Dave Jones has warned his Cardiff City players against complacency after Chris Burke's winner at Middlesbrough fired the club to third in the Championship.The Bluebirds' 1-0 win at the Riverside was their third successive victory over a promotion contender in eight days as West Brom and Preston were also beaten. [LNB]But Cardiff manager Jones admitted: "Results, when you're wining, might sometimes cover some cracks. [LNB]"And we have to try to make sure we make those cracks water tight." [LNB]Jones praised his Cardiff's hard work and determination in their gritty and morale-boosting victory at Boro on Sunday. [LNB]But the Championship's longest-serving boss insists there is room for improvement despite moving to within two points of the automatic promotion places. [LNB]Jones, for example, is desperate for player reinforcements in the January transfer window as he often bemoans the lack of strength in depth in his squad. [LNB]Wales international Joe Ledley and Riccardo Scimeca, the 34-year-old injury-prone veteran, are carrying injuries as Jones concedes central midfield is his "problem area."[LNB] Our defence and goalkeeper put in performances to be proud of. Confidence makes the heart grow fonder im_dai_hunt Stephen McPhail, meanwhile, is out until the new year as he undergoes cancer treatment. [LNB]Now Jones has fresh injury concerns after the win at Middlesbrough as winger Peter Whittingham (thigh), attacker Kelvin Etuhu (ankle) and full-back Kevin McNaughton (calf) to take the gloss of a battling victory. [LNB]Burke's inswinging left-wing free-kick on the hour deceived keeper Brad Jones and the Boro defence and dropped into the far corner of the net as the Scottish winger scored his third goal in successive. [LNB]Although Jones was pleased with Cardiff's third successive win, third successive clean sheet - their eighth shutout of the season - and third successive win at Middlesbrough, he was at pains give his confident side a reality check. [LNB]"We will watch the video and see where we can improve, in attack as well as in defence," Jones told BBC Sport. [LNB]"It is a results business but there is a lot of things we can do to be better and there are lots of areas of our game that we can certainly improve on. [LNB]"It has been a good week but we're not getting carried away and we've got to to continue that." [LNB]Jones is trying to bring his side back down to earth for Saturday's home game with Leicester City, another play-off contender, in a third against fifth showdown. [LNB]Cardiff have only beaten the Foxes once in Leicester's last four visits to south Wales but Nigel Pearson's side have won only won once in four games.