The goalkeeper is alleged to have thrown a water bottle into the crowd at St Mary's as well as swearing at supporters after he conceded a second goal.
It had been reported that Saints had already looked at the video evidence and decided that the former Poland international had no case to answer.
However, a club statement read: "Southampton Football Club can confirm that it is investigating allegations of an incident involving Artur Boruc that occurred towards the end of the first half during Sunday's match against Tottenham Hotspur.
"The club takes such allegations extremely seriously and will deal with the matter in the appropriate manner."
Bayern Munich are kings of Germany and hope to be crowned kings of Europe at Wembley later this month!
The Juventus jersey for the 2013/14 was released earlier this week. Be the first to wear the colors of the Old Lady.
adidas has added some color to the Predator line with this new colorway. Released on May 17. Be the first to own a pair.
The new PUMA evoSPEED 1.2 FG. A great new soccer cleat with classic look and first time for PUMA to be on the cleat.
The adidas Nitrocharge is the most talked about new cleat in years. It was released on May 15 and will take your pitch by storm.
One of the top soccer cleats for control the Nike CTR360 will not let you down on the field in tight spaces.
Chelsea won the Europa League on Wednesday. The Blues defeated Benfica 2-1 on injury time goal from Ivanovic.
The Liverpool 2013/14 soccer jersey is available for pre-order. The Reds are eager to compete for silver next season.
The push for more color on their cleats, adidas has added the infrared colorway to the adiZero f50 Line.
Ajax has released their away soccer jersey for the 2013/14 season. Get in the Gear.