Audio By Carbonatix
Goalkeeper Petr Cech has been named in Chelsea's Premier League squad - despite having retired from playing at the end of the 2018-19 season.
The 38-year-old, who is the club's technical and performance adviser, was added as "emergency cover".
Elsewhere, midfielder Mesut Ozil has been left out of Arsenal's 25-man squad.
Manchester United have not included defender Phil Jones and goalkeeper Sergio Romero in their list.
Clubs had to name a 25-man squad after the closure of both the international and domestic transfer windows.
Cech spent 11 years as a player at Stamford Bridge, winning 13 trophies, including four Premier League titles and the Champions League.
He last played for the Blues in the 3-1 win over Sunderland in May 2015, before joining London rivals Arsenal.
The former Czech Republic international then returned to Chelsea in the summer of 2019 to take up his new role and has recently been helping with the goalkeeping coaching.
"Petr Cech has been included in the squad as emergency goalkeeper cover. This is a precautionary step due to the unprecedented conditions currently caused by the Covid-19 crisis. He takes up a position as a non-contract player," said a Chelsea club statement.

Ozil, 32, who joined Arsenal for a then club record £42.4m in 2013, has not played for the Gunners since 7 March.
The German, who had also been left out of their Europa League squad, will now only be able to play for Arsenal Under-23s until his deal expires in summer 2021.
Greece defender Sokratis Papastathopoulos was also omitted.
Latest Stories
-
Kwame Dadzie: Don’t spend government’s GH¢5 million to film sector
12 minutes -
Former Accra Mayor Blankson endorses Wontumi for NPP national chairmanship
1 hour -
Eid festivals explained on Behind The Lens with Queen Liz
1 hour -
Meet Emelia Naa Ayeley Aryee, the Ghanaian Gender Advocate helping couples overcome infertility stigma
2 hours -
Oil pulls back as traders look for progress on US-Iran talks
2 hours -
The proposed imposition of a 0.75% fee on Mobile Money-To-Bank transfers raises serious concerns regarding fairness, financial inclusion, and the underlying principle of interoperability within the digital financial ecosystem
2 hours -
Trump raises refugee ceiling by 10,000 to bring in more white South Africans
3 hours -
One killed and others missing after chemical explosion at US paper mill
3 hours -
First Ghanaians set to be repatriated from South Africa over anti-immigrant protests
3 hours -
Deliver or be questioned – Majority Chief Whip warns OSP
3 hours -
Crime is everywhere – Dafeamekpor slams OSP’s Accra-centred operations
3 hours -
Don’t be cocooned in Accra – Dafeamekpor pushes OSP to invade districts
4 hours -
Free sanitary pads and pad bank Initiative cut teenage pregnancy in Bosomtwe – Girl Child coordinator
4 hours -
Asunafo North Municipal Assembly deploys DL-Rev Software to tackle revenue shortfall
4 hours -
General Mosquito promised to ‘annihilate’ NPP – Dafeamekpor reveals details of earlier tour
4 hours