Ahead of his side's midweek game, Guardiola heaped praise on Allardyce for his managerial abilities and expected a good matchup on the night.
They remain in the relegation zone, six points behind 17th-placed Brighton.
"It is not easy to take over a team during the season, but against Wolves, Liverpool, other clubs he [Allardyce] got good results", Guardiola said.
Manchester City boss Pep Guardiola has dismissed talk of the quadruple as a fairytale.City booked an FA Cup fifth round trip to Swansea after avoiding a massive upset at Cheltenham with a 3-1 comeback win on Saturday. "Sometimes you wonder what is first - do the results make you play good or do you play good if you get results?"
However, Aguero who is City's all-time top scorer, is yet to score in the Premier League this season and has played just 31 minutes of top-flight football since his last start on 24 October.
"When you have won 10 games in all competitions, focus on the next one".
A win over Wolverhampton Wanderers and a draw against Liverpool has helped them along.
In four home games since the former England manager took charge, West Brom have conceded 17 goals without reply.
Guardiola admits he pays little attention to the current table and played down the significance of potentially moving ahead of Manchester United this evening, insisting his focus remains exclusively on results and securing another three points this evening.
"It's just (thinking about) West Bromwich, seeing what they have done since Sam Allardyce took over the team, trying to analyse the individual qualities - especially up front with the quality of (Matheus) Pereira - trying to make a good game and to get another victory". After (that) we see what happens.
Cheltenham defended solidly until Phil Foden volleyed home from Joao Cancelo's cross in the 81st minute and Gabriel Jesus put Pep Guardiola's men ahead after controlling Fernandinho's diagonal ball three minutes later, before Ferran Torres confirmed the win in injury time. I don't see much of the table. I didn't when we were 12th, eight points behind.