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John Arne Riise's own goal gave Chelsea a welcome boost in the Champions League semi-final first-leg at Anfield on Tuesday. The Norweigan's last-minute attempt at a headed clearance deflected into the top corner of Jose Reina's goal in the 95th minute to send the away support into raptures. It also handed Chelsea the initiative in a tie in which, historically, they have seemed cursed. The vital away goal could well prove to be the turning point in the tie, particularly as Stamford Bridge has been built into a fortress for Avram Grant's side over the years.

Grant will be hoping that the dramatic late equaliser will provide his side with the confidence needed to gain a win on Saturday. The way the Champions League games have fallen, Chelsea will take a slight advantage into the game anyway. They have had one more day's rest compared to Man United, whilst the latter have had to travel to and from Barcelona in that time. Also, Chelsea will not face Liverpool in the second-leg until Wednesday, whereas United host Barcelona on Tuesday night. It may only seem like a slight advantage, but it does mean that Chelsea can definitely field a full-strength side, whilst a potentially jaded United may have one eye on Tuesday and look to rest a couple of players.

That in itself leads to another issue - just what is Chelsea's best team? Rafa Benitez and a Chelsea manager of the past, Claudio Ranieri, have been labelled 'tinkermen' for their tendencies to rotate their squads, but is Avram Grant any different? One could argue that, such is the depth of Chelsea's squad, rotation is the only way to manage it. Players such as Ballack, Malouda and Anelka will not happily sit on the bench and wait until someone in their position is unavailable for them to get their chance to impress. Such players are of a calibre that demands they play at least half-regularly unless, of course, there is a strong enough character to manage them.

This was perhaps where Jose Mourinho excelled - he knew his best eleven, played it as consistently as he could and most definitely in the big European and Premier League games. Avram Grant, on the other hand, seems unable to reach such a definition. Juliano Belletti or Paulo Ferreira at right-back? At the moment he favours the Portuguese, but it would not be a surprise to see Belletti turn out against Man United. A similar problem follows in other positions. Michael Ballack played at Anfield, but seems to be utilised as a European specialist and could well give way to Michael Essien at the weekend.

Then there is Nicolas Anelka. No-one could deny the French striker's obvious ability, but Chelsea do not seem to have thought through buying him. He just doesn't fit into their 4-5-1 / 4-3-3 system, unable to play as the lone striker in Drogba's absence and isolated when played out on the wing. Quite what team will be played on Saturday is anyone's guess, although Petr Cech, John Terry, Frank Lampard and Didier Drogba are available, so at the least the spine of the team will be there.

As for Man United, their trip to Barcelona was a mixed bag. They went into the game missing Nemanja Vidic, the player who has formed a great central-defensive partnership with Rio Ferdinand, due to a stomach bug. Wes Brown was moved across from right-back to replace him and the versatile Owen Hargreaves was asked to drop back to take over Brown's usual position. It was far from ideal in such a big match, but United coped well defensively and withstood much pressure from the Catalan giants. Samuel Eto'o, Deco and and substitute Thierry Henry all had chances in the game, so the final score of 0-0 is a credible one to take back to Old Trafford.

However, it should have been advantage United as early as the third minute as they were awarded a penalty, Milito handling the ball from a Ronaldo header. The Premier League's top scorer then showed that he is in fact human by sending his spot-kick wide of the right post. This could, strangely, give United an edge on Saturday. Ronaldo is devastating enough normally. When he has a point prove, well, let's say Ashley Cole could be in for a rough 90 minutes.

As established, Chelsea's team selection will be interesting on Saturday, but United's could be even more so. Even if they are beaten, it is unlikely that they will not win the Premier League. It would put them on even points with Chelsea, with a superior goal difference and games against West Ham and Wigan to come; games that Manchester United will almost certainly win if they need to. With the weekend trip to Stamford Bridge sandwiched between the Barcelona games, Fergie would ideally like to rest some key players. In a game of this magnitude, it would be an arrogant move to do so, but one that Sir Alex would take great pleasure from. What better than John O'Shea scoring the winning goal to clinch the league title at Chelsea to really rub salt into the wound?

Only last year Chelsea's players were forced to welcome their Manchester rivals onto the Stamford Bridge pitch with a guard of honour. Watching Chris Eagles, Kieran Richardson and Alan Smith, along with other reserve players, come on to the pitch, with the league sewn up, would have been a bitter pill for John Terry and co to swallow. A Chelsea win may not change a great deal in the grand scheme of things - but it will stop United sealing it at their own ground and that will be motivation enough for the Blues.

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