What is Gylfi Sigurðsson?
{{Infobox football biography | name = Gylfi Sigurðsson | image = ISL-HRV (21) (cropped).jpg | caption = Gylfi with [[Iceland national football team|Iceland]] at the [[2018 FIFA World Cup]] | fullname = Gylfi Þór Sigurðsson<ref>{{cite web |url=https://www.premierleague.com/news/612828 |title=Updated squads for 2017/18 Premier League confirmed |publisher=Premier League |date=2 February 2018 |access-date=11 February 2018}}</ref> | birth_date = {{birth date and age|1989|9|8|df=y}}<ref name=Hugman201011>{{cite book |editor-first=Barry J. |editor-last=Hugman |title=The PFA Footballers' Who's Who 2010–11 |url=https://archive.org/details/pfafootballerswh0000unse_v9b9 |year=2010 |publisher=Mainstream Publishing |location=Edinburgh |isbn=978-1-84596-601-0 |page=[https://archive.org/details/pfafootballerswh0000unse_v9b9/page/n379 378]}}</ref> | birth_place = [[Reykjavík]], Iceland | height = 1.86 m<ref>{{cite web |url=https://tournament.fifadata.com/documents/FWC/2018/pdf/FWC_2018_SQUADLISTS.PDF |title=2018 FIFA World Cup: List of players |publisher=FIFA |page=13 |date=21 June 2018 |archive-url=https://web.archive.org/web/20180619164139/https://tournament.fifadata.com/documents/FWC/2018/pdf/FWC_2018_SQUADLISTS.PDF |archive-date=19 June 2018 |url-status=dead}}</ref> | position = [[Attacking midfielder]] | currentclub = [[Lyngby Boldklub|Lyngby]] | clubnumber = 18 | youthyears1 = 2002 | youthclubs1 = [[Fimleikafélag Hafnarfjarðar|FH]] | youthyears2 = 2003–2005 | youthclubs2 = [[Breiðablik UBK|Breiðablik]] | youthyears3 = 2005–2008 | youthclubs3 = [[Reading F.C. Under-21s and Academy|Reading]] | years1 = 2008–2010 | clubs1 = [[Reading F.C.|Reading]] | caps1 = 42 | goals1 = 18 | years2 = 2008 | clubs2 = → [[Shrewsbury Town F.C.|Shrewsbury Town]] (loan) | caps2 = 5 | goals2 = 1 | years3 = 2009 | clubs3 = → [[Crewe Alexandra F.C.|Crewe Alexandra]] (loan) | caps3 = 15 | goals3 = 3 | years4 = 2010–2012 | clubs4 = [[TSG 1899 Hoffenheim|1899 Hoffenheim]] | caps4 = 36 | goals4 = 9 | years5 = 2012 | clubs5 = → [[Swansea City A.F.C.|Swa