Chelsea face Roma on Wednesday in their Champions League Group A fixture before playing Premier League title rivals Liverpool on Sunday.

Scolari is already reeling from an injury crisis that threatens to disrupt their admirable progress on both European and domestic fronts.

Goalkeeper Petr Cech and influential midfielder Deco are almost certain to return for the Roma clash at Stamford Bridge but they will still be without many of their big-name players including Didier Drogba and Michael Ballack.

However, Ashley and Joe Cole are expected to return to action and there is increasing hope centre-half Ricardo Carvalho will be fit enough to rejoin the squad after his knee problem.

"I have been thinking about Roma and Liverpool and yes, this is the toughest week so far," admitted Scolari.

"All weeks are tough but I make them easy because if I thought about things any differently, I would be dead in one week.

"I am happy because against Roma I will maybe have Ricardo Carvalho, Petr Cech, Joe Cole, Ashley Cole," said Scolari.

"They are coming back at the right time. They are not in the best condition but when we play Liverpool we will be almost at full strength and that is important.

"Roma have changed some players and started the season in not good condition, but now they are better.

"They played well in the last two or three games and we respect them because they have history and quality. They have an intelligent coach and they are improving."

Chelsea play Roma at home and away in their next two Champions League matches and England midfielder Frank Lampard believes the results will define the outcome of the group.

The Italian side and CFR Cluj will battle it out for the two knockout stage places with Chelsea and the Italians are the team Lampard feels will offer the most problems.

"For Bordeaux it is going to be very difficult but for Roma, ourselves and Cluj, the next two games are very important.

"Whoever can get positive results has a very good chance of going through," admitted Lampard.

"It was no surprise that Cluj played well against us. Their result against Roma proved they were a good team.

"Their team played very well against us. They defended cleverly and they counter-attacked very fast."