Senegal 'keeper Mendy has missed Chelsea's past two games after aggravating a hip injury during last week's Champions League win against Zenit Saint Petersburg.
Tuchel's team beat Manchester City three times last season -- including in the Champions League final.
Pulisic was hurt on Wednesday in the United States’ 4-1 win over Honduras in a World Cup qualifier.
Trevoh Chalobah's brilliant performances at the start of this campaign have not changed Chelsea's mind to go after Seville's Frenchman Kounde, say multiple reports.
Lukaku was on Chelsea's books for three years between 2014 and 2017, but made just 15 appearances as he spent two of those three seasons on loan.
The German's deal will keep him in charge of the Premier League club through June 2024, after being hired in late January on an 18-month contract to replace the fired Frank Lampard.
City have had to wait 13 years since being taken over by Abu Dhabi's Sheikh Mansour just to get to the Champions League final.
They also saw why Chelsea, ruthlessly perhaps, fired Lampard in January and replaced the club legend with Tuchel.
Chelsea set up a final showdown against Manchester City in the finals of the Champions League after defeating Real Madrid in the second-leg semi-final.
Chelsea were one of the 12 clubs to sign up to the ESL project, which would have put an even greater strain on players, with a minimum of 18 regular-season games for all the clubs involved.
Timo Werner scored the lone goal of the match as Chelsea registered a victory to move to the fourth spot in the Premier League standings.
Chelsea has not lifted a trophy since their 2019 Europa League success under Maurizio Sarri. The side remains in contention for the Champions League and FA Cup this season.
Kovacic admitted he was worried at one stage but now is confident that the season will end well for the team if they maintain their consistency.
Hakim Ziyech and Emerson scored one goal each in the match to power the Premier League side into the quarter-finals of the competition.
Coach Thomas Tuchel left key men Neymar, Thiago Silva and Thomas Meunier out of the squad with Wednesday's Champions League clash with Napoli in mind.