Heart of Midlothian's transfer news is making headlines as Celtic manager battle heats up between Martin O'Neill and Robbie Keane. The two former Republic of Ireland managers are reportedly in a head-to-head battle to be Celtic manager. Major shareholder Dermot Desmond is holding talks with Robbie Keane on Monday, with the former Ferencvaros head coach earmarked as the frontrunner to be Celtic's new permanent manager. Robbie Keane would want a backroom team of Stephen Glass, Scott Brown, and Jonny Hayes if he becomes the Scottish champions' manager. Meanwhile, Rangers head coach Danny Rohl has reportedly dropped down the pecking order in Wolfsburg's next manager hunt, with the relegated German club setting their sights on Verl boss Tobias Strobl. Estoril sports director Helena Costa says they are still planning for next season with Ian Cathro as head coach but admits there is a lot of interest in the former Heart of Midlothian and Dundee United boss. Arne Engels has joined a new agency as he seeks a move away from Celtic and several Premier League and Serie A clubs, including AC Milan, are monitoring the 22-year-old midfielder. Alex Oxlade-Chamberlain's fiancee, Little Mix singer Perrie Edwards, is hoping Celtic take up the option to extend the 32-year-old midfielder's contract for another season. Celtic have again rejected an offer from Lech Poznan to sign Luis Palma following the winger's loan spell and the Polish champions have a week to pay the £3.5m option to buy with Sevilla monitoring the 26-year-old's situation. Sevilla have entered the race to sign Celtic winger Luis Palma after the Scottish champions rejected Lech Poznan's attempt to negotiate their option-to-buy from £3.5m to around £2.6m.