Mansfield were unable to come to a permanent deal and Elsnik ended up at Sixfields where Stags head on Saturday.
“The way it worked out – the deal wasn’t right for the football club or for Derby so we moved on,” said Mansfield manager David Flitcroft.
“Timi knows what I feel about him. I have worked with him twice, once at Swindon and then here. He had a brilliant rapport with the lads.
“Timi is a top pro. He is a great person, an absolutely lovely guy, and I wish nothing but the best for him in his career – just not on Saturday.
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“I have spent a lot of time with him and we have shared a lot. I have shared a lot about my family and his family and he is someone I admire immensely.”