Leeds United won against Middlesbrough at Elland Road in the Championship last weekend.
Jansson featured for Leeds in the Championship game against Middlesbrough at home on Sunday afternoon.
The Sweden international central defender started the match at Elland Road and played for the entire 90 minutes.
The 26-year-old centre-back played well for the Whites, who got the better of Boro 2-1 to return to winning ways.
Former Leeds striker Whelan was impressed with the performance of Jansson, and has suggested that the former Torino star was back to his best against Garry Monk’s side.
Whelan was also impressed with Leeds central defender Liam Cooper’s performance against Middlesbrough.
“Well, he has found something,” Whelan told BBC Radio Leeds about Jansson. “He has found the Jansson that we loved him from last season, that aggression, that determination, that leadership skill that he he has got.”
“He is coming to his own this season, he really has,” added Whelan about Cooper.
Leeds will return to action this evening when they take on Wolverhampton Wanderers away from home in the Championship.
Wolves are the current league leaders and will head into the match at the Molineux Stadium as favourites, although one should not be surprised if Thomas Christiansen’s side do pick up a point from the encounter.
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