Arrivals in Britain from "Red List" countries are subject to 10 days' hotel confinement, which would apply to Brazilian trio Alisson Becker, Roberto Firmino and Fabinho and Portugal forward Diogo Jota.
It has been a whirlwind start to life back in Paris for Pochettino, who played for PSG between 2001 and 2003.
Abraham, who has scored 12 goals in 30 appearances for Chelsea this season, was also substituted at half-time against Southampton the previous week.
Chelsea boss Thomas Tuchel reveals PSG's Champions League loss to Manchester United left him in 'a dark place'
PSG were able to bounce back and win the Ligue 1 title before Tuchel led them to a Champions League final defeat against Bayern Munich last season.
Premier League: Manchester United can't give Chelsea any hope of catching them, says Ole Gunnar Solskjaer
United were knocked off top spot by Manchester City on 26 January and a run of just two wins in six top-flight matches means they are now 10 points behind their rivals.
Champions League: Olivier Giroud's acrobatic strike helps Chelsea beat Atletico in first-leg of Round of 16
Diego Simeone's side had put on a typically disciplined defensive performance until that point but Giroud's moment of genius means they will have to score in London on 17 March if they are to avoid an early exit.
Champions League: Versatile and experienced Ilkay Gundogan central to Manchester City's trophy pursuit
Gundogan is already having his best ever goalscoring season with 13 in all competitions, 11 of which have come in his last 13 Premier League games
Champions League: Thomas Tuchel urges Chelsea to be wary of Luis Suarez threat ahead of Atletico Madrid clash
Seven games into his reign as Chelsea manager, Tuchel remains unbeaten, with the Londoners fifth in the Premier League and into the FA Cup quarter-finals.
After a run of 68 league games unbeaten at Anfield, injury-ravaged Liverpool have lost their last four on home turf for the first time since 1923.
Tuchel said he would need all of his players to cope with a frantic schedule as Chelsea compete in the Premier League, Champions League and FA Cup.
European football matchday: Chelsea face second-tier Barnsley in FA Cup; Athletic Bilbao host Levante in Copa del Rey
Rennes travel to face first-division rival Angers and Saint-Etienne go to second-tier Sochaux in the French Cup’s remaining round of 64 games.
FA Cup: Chelsea manager Thomas Tuchel 'absolutely not concerned' about N'Golo Kante despite injury struggles
Kante will start Thursday's FA Cup fifth-round clash at Barnsley in a much-changed Blues line-up, with new boss Tuchel delighted by the 29-year-old's return to fitness.
Premier League: Chelsea boss Thomas Tuchel not worried by Timo Werner’s goal drought, hails effort in Sheffield United win
Werner set up Mason Mount's opener and won the decisive penalty, converted by Jorginho, as Chelsea closed to within a point of the top four with a third win in Tuchel's four games in charge.
Chelsea’s form has been inconsistent this season, and after a shaky first-half of the ongoing term, the Blues decided to sack manager Frank Lampard and name former Paris Saint-Germain boss Thomas Tuchel as replacement.
For the first time in Mourinho's managerial career, he has lost back-to-back home league games.
Premier League: Mohamed Salah stars as Liverpool beat West Ham; Leandro Trossard's goal helps Brighton beat Tottenham
Jurgen Klopp's injury-hit champions appeared to have lost their way after a five-game winless spell but are back on track after beating Tottenham and West Ham in the space of 72 hours.
The close-season signing from Leipzig was expected to fire Chelsea's attack, but he has just nine club goals this term.
Premier League: Newly-appointed manager Thomas Tuchel says he joined Chelsea due to a 'hunger of titles'
The German said a title challenge was not realistic this season with Chelsea 11 points adrift of leaders Manchester City, but wants to challenge for silverware in the FA Cup and Champions League.
Tuchel conceded after Wolves draw that Chelsea have no chance of winning the title and will have to battle hard to qualify for next season's Champions League
Premier League: Manchester United's title hopes take major hit; Chelsea's Thomas Tuchel era starts with stalemate
Burnley beat Aston Villa 3-2 to pull nine points clear of the relegation zone, thanks to Chris Wood's late winner.