=== Tottenham Hotspur ===
Ved starten af 2016-17-sæsonen skrev Lesniak under på lejeaftale med [[FC Slovan Liberec|Slovan Liberec]] i [[Tjekkiet]]. Den 31. juli 2016 fik han sin debut i ligaen i en kamp mod [[Mlada Boleslav]].<ref>{{cite web |url=http://www.sofascore.com/mlada-boleslav-slovan-liberec/uUszU |title=Mlada Boleslav - Slovan Liberec |publisher=Sofa Score |date=31. juli 2016 |accessdate=11. oktober 2016 |archive-date=12. oktober 2016 |archive-url=https://web.archive.org/web/20161012074357/http://www.sofascore.com/mlada-boleslav-slovan-liberec/uUszU |url-status=ok }}</ref> Lesniak spillede dog kun to yderligere kampe i ligaen, en [[UEFA Champions League kvalifikationsfase og playoffrunde 2016-17|UEFA Europa League-kvalifikationskamp]] mod [[Admira Wacker Mödling]] og en cupkamp.<ref>{{cite web |url=http://www.eurosport.co.uk/football/europa-league/2016-2017/live-slovan-liberec-fc-admira-wacker-modling_mtc864193/live.shtml |title=Slovan Liberec 2-0 FC Admira Wacker Mödling |date=3. august 2016 |accessdate=11. oktober 2016 |publisher=Eurosport |archive-date=12. oktober 2016 |archive-url=https://web.archive.org/web/20161012002301/http://www.eurosport.co.uk/football/europa-league/2016-2017/live-slovan-liberec-fc-admira-wacker-modling_mtc864193/live.shtml |url-status=ok }}</ref> Han returnerede til Tottenham den 31. december 2016.<ref>{{cite web |url=http://www.hitc.com/en-gb/2017/05/18/everything-you-need-to-know-about-tottenham-player-filip-lesniak/ |title=Everything you need to know about Tottenham player Filip Lesniak |publisher=HITC |author=Vincent Ralph |date=18. maj 2017 |accessdate=20. maj 2017 |archive-date=18. maj 2017 |archive-url=https://web.archive.org/web/20170518172804/http://www.hitc.com/en-gb/2017/05/18/everything-you-need-to-know-about-tottenham-player-filip-lesniak/ |url-status=ok }}</ref>
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