Manu Koné heading to Serie A’s Roma from Borussia Mönchengladbach after three years with the Bundesliga side, the two clubs said. “AS Roma is pleased to announce the signing of Manu Koné on loan, with a mandatory buy option,” the Serie A club said. Although Gladbach did not disclose the fee, it reportedly is one of the most expensive tranfers in club history. German newspaper Bild reported that Gladbach will receive €20 million ($22 million) plus bonuses for the 23-year-old midfielder. Granit Xhaka’s tranfer to Arsenal in 2016 for an estimated €45 million is currently Gladbach’s most expensive…