GLASGOW (AFP) - Steve Davis believes that Rangers have a midfield strong enough in depth and quality to help the Ibrox club collect a domestic treble this season. The Northern Ireland skipper, who spent time on loan at the club last season, became a permanent addition to the Rangers squad in the summer along with Portuguese playmaker Pedro Mendes and American Maurice Edu. Captain Barry Ferguson is set to return from his four-month injury absence against Inverness Caledonian Thistle on Saturday in their Scottish Premier League clash and the Ibrox club also have Kevin Thomson, Lee McCulloch and Charlie Adam all fighting for a midfield spot. And Davis has no doubt that the Light Blues have now assembled a midfield strong enough to compete for trophies over the next few years. He said: "We are looking very strong in midfield now. With Barry Ferguson hopefully ready to make his comeback against Inverness on Saturday and myself, Kevin Thomson and Pedro Mendes all in there. "The likes of Lee McCulloch, Maurice Edu and Charlie Adam are in the mix as well, so we have the depth in quality to take the club forward over the next few years. "With the injury to Barry we have seen how important it is to have depth in the midfield or any area and we have coped well especially with Pedro coming in. "Against Hamilton we had Kevin Thomson out injured and Kyle Lafferty slotted in and scored a goal from left and that shows you just how much cover we have in there. "But that will be vital over the coming months as we know that if we want to maintain a challenge on all three fronts." Davis also admitted he is excited about the prospect of playing alongside returning skipper Ferguson and Portuguese play maker Mendes. He said: "I have really enjoyed playing with Pedro Mendes since he has come to Rangers. He has been a great signing for us and now with Barry coming back it is an exciting thought about the two of them playing together. "Pedro has tremendous vision and awareness and his technique is excellent and hopefully we played pretty well in midfield together against Hamilton. "He is a Portuguese international and a Premiership class player and he will do a great job at Rangers." On Sunday Celtic travel to Edinburgh to take on Hearts at Tynecastle with defender Glenn Loovens ruling himself out of the game with a thigh injury. Captain Stephen McManus could return to the side having missed the midweek trip to Kilmarnock. In Saturday's other matches Aberdeen host Kilmarnock with the Pittodrie club's director of football Willie Miller publicly quashing rumours about manager Jimmy Calderwood's future. Third-placed Killie will be looking to bounce back from last weekend's defeat to Falkirk. Dundee United travel to Falkirk with both club's on a high following their progression to the semi-finals of the Co-operative Cup thanks to midweek wins against Dunfermline and Inverness CT respectively. Hamilton make the short journey to Motherwell for a Lanarkshire derby looking to stop their winless streak of four games in the SPL. St Mirren host Hibernian at Love Street with Buddies manager Gus MacPherson, manager of the month award for October, hoping his side can pick up the win after losing to Dundee United last weekend. Fixtures (1500 GMT, unless otherwise stated) Saturday Aberdeen v Kilmarnock, Falkirk v Dundee United, Motherwell v Hamilton, Rangers v Inverness CT, St Mirren v Hibernian Sunday Hearts v Celtic (1400)