Celtic boss Ronny Deila has told Sky Sports that full back Saidy Janko is a 'great prospect' - but noted that he must improve defensively.
Deila saw a half-strength Celtic side coast to victory over Dundee United on Saturday afternoon, as goals from Leigh Griffiths and Callum McGregor either side of a Mark Durnan own goal handed Celtic the 3-1 victory at Tannadice.
The Bhoys were impressive in their victory, but no players quite stole the limelight like right back Saidy Janko, whose display delighted Celtic fans.
The Swiss right back, 19, joined Celtic in a permanent move from Manchester United earlier this summer, but was largely seen as one for the future - even after the sale of Adam Matthews to Sunderland.
However, on Saturday Janko showed what he can do, serving up an outstanding attacking display, tormenting Dundee United down the right hand side time and time again, especially in the first half.
Janko's defensive work leaves a little to be desired, and manager Deila told Sky Sports that whilst Janko is a 'great prospect', he must focus on improving his defensive work.
"He is a great prospect for us - very strong and quick and offensively he caused them a lot of problems in the first 35 to 40 minutes. "I think he got tired after a while and he needs to work a little bit on discipline and positioning. But there are a lot of good things to work on and a lot of talent out there."
Deila now has a decision to make over Janko. First choice right back Mikael Lustig is injured and looks set to miss the crucial trip to Malmo on Tuesday as Celtic look to book their place in the Champions League group stage.
Janko was superb against Dundee United but will have major concerns on his defensive capabilities, especially with Celtic away from home, where they will have to defend a Malmo barrage after the Bhoys' 3-2 first leg victory.
It's more likely that Efe Ambrose features at right back, but if Deila wants to take more of a risk but bring an attacking threat to his side, Janko could well be in contention to start against Malmo on Tuesday.