Danish left-back Knudsen joined Ipswich Town on a three-year deal last summer, keeping him at the Club until 2018.
The 23 year-old has already made over 100 domestic appearances for Danish Superliga side Esbjerg and is well known for his long throw-in.
Knudsen played all three of his country’s Under-21 European Championship matches last summer as Denmark came third in a group which contained eventual winners Sweden.
He has also established himself in the Danish national side, and has two caps to his name thus far.
Jonas scored his first goal for Town in a 1-1 draw with Fulham at Portman Road towards the end of the 2015/16 campaign.
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