Arsenal produced a three-goal burst in eight minutes on Saturday to beat Liverpool 4-1 and strengthen their chances of a Champions League spot.
Olivier Giroud and Alexis Sanchez guided Arsenal to a 2-1 victory at Premier League struggler Queens Park Rangers on Wednesday.
Sanchez, who has scored 18 goals in all competitions this season, missed the 5-0 win over Aston Villa due to a hamstring injury.
Sanchez, who has struck 18 in all competitions since his arrival is continuing his recovery from a hamstring problem.
Sanchez's scintillating form since arriving in the Premier League could give frugal Wenger belief that Arsenal can find value for money during the January transfer window.
Sanchez scored twice after creating the opener as Arsenal eased to a 3-0 victory over Stoke and moved up to fifth in the Premier League.
Walcott was thrilled to be back in business for Arsenal in their FA Cup third round win as he declared his delight at playing alongside Sanchez.
Sanchez scored one goal and set up another to make up for a moment of madness from team-mate Olivier Giroud and help Arsenal beat Queens Park Rangers 2-1.
Sanchez joined Arsenal last summer in a 30 million euros move from Barcelona and has since scored 14 goals in 22 games.
With a hectic Christmas fixture list looming, Arsenal manager faces a dilemma over prize asset Alexis Sanchez.
Alexis Sanchez is making quite an impression after a promising start to his career in north London.
Sanchez rescued Arsenal again by scoring in the 89th minute on Wednesday to secure a 1-0 win over Southampton in the Premier League.
Sanogo ended his 15-month wait to score for Arsenal to help the London club beat Borussia Dortmund and qualify for the Champions League knockout phase for the 15th successive season.
Arsenal, who blew a three-goal lead against Anderlecht in the last match, can join Borussia Dortmund in the last 16 with a draw.
United benefited from an own goal and then a late strike by Wayne Rooney to beat Arsenal to claim first away win of the season.
Swansea scored twice in less than three minutes to rally to a 2-1 victory over Arsenal in the Premier League on Sunday.
A remarkable late collapse scuppered Arsenal's hopes of qualifying early for the Champions League last 16 as Mitrovic's 90th-minute goal earned Anderlecht a deserving draw.
A second-half double from Sanchez and a first goal for Calum Chambers handed Arsenal a 3-0 victory over Burnley on Saturday in the Premier League.
"Sanchez took advantage of the mistakes they made. He has quick feet and that's why he wins many balls that normal players don't win," said Wenger.
Arsenal won their first Premier League match in over a month on Saturday, beating Sunderland 2-0 with a brace from Alexis Sanchez.
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