Celtic are looking to replace Adam Mathews at the right-back slot with Janko as the former has been linked with a move to Queens Park Rangers.
Janko, along with Marouane Fellaini, was the only deal made by ex-Manchester United boss David Moyes in the summer of 2013, arriving from FC Zurich in the Swiss League.
Sharply contrasting to Fellaini's meteoric rise under Louis Van Gaal, Janko has only broken into the first-team once, appearing in the Capital One Cup drubbing against Milton Keynes.
He went out on loan on deadline day to Bolton Wanderers, in exchange for Englishman Andy Kellet. He had a mixed time there, appearing just eight times and assisting once and scoring a solitary goal, a screamer from 25 meters.
His performances for the reserves earned him the Manchester United U-21 Player of the Season title in his debut season. It is a coveted award, having been previously won by the likes of Adnan Januzaj and Ryan Giggs.
Celtic Park would be home to some quality banter as Celtic's first signing of the summer Dedrick Boyata was poached from United's cross-town rivals, Manchester City. Expect some fireworks to fly in the dressing rooms if the deal is to go through. Or not.
Janko wouldn't be the first to leave in search for first-team football and would probably be followed by more youngsters from their parent clubs.
This would mainly be due to the great figures of money involved in the Premier League now, and promising youngsters getting fewer chances in the first-team, with imported foreigners being trusted more.