Manchester City's manager Manuel Pellegrini says the matter should be dealt with correctly and he doesn't believe it will directly affect the player's performance.
At this stage we have received complaints about two separate tweets of a racist nature aimed at Yaya Toure and now we are informing the police.
Yaya Toure has been on Twitter for a matter of hours and he has already received abuse of an appalling nature.
We are disturbed by the fact that someone can be treated this way.
It makes footballers start to question why they should use these platforms.
We will offer Yaya Toure our full support.
On Monday evening Toure favourited a tweet from one City fan - @111Lesley111 - who offered her support to the former Barcelona player
This is not the first time Toure has been the target of racist abuse.
Last season he was subjected to racist chanting during City's Champions League game at CSKA Moscow.
"I'm not just disappointed, I'm furious," Toure said after City's 2-1 win in Russia.
"It was unbelievable and very sad."
CSKA denied Toure had been abused, but UEFA disagreed and ordered the Russian club to close part of their ground for their next Champions League match.
The police have been called to investigate claims Yaya Toure was racially abused within hours of reactivating his Twitter account. The Manchester City midfielder, rejoined following City's derby day victory over United.
He wrote: "Great to be back on twitter after a good win yesterday. Now my focus is on the next game... Happy Monday everyone!!" Within hours of posting the message, the 31-year-old received abusive and racist messages from other Twitter accounts.
It prompted fury on the social networking website which was spotted by Toure, who favourited three tweets which supported him and called for action.
Posters complained to both GMP and the Metropolitan Police on Twitter. A spokesman for GMP said it was aware of the message and would be looking into the matter further.
Toure quit Twitter during earlier this year, saying he wanted to concentrate on the World Cup.
Manchester City will hope to have kick-started their season after emerging victorious from a frenetic derby against 10-man United.Read the full story ›
Wayne Rooney has been passed fit for the Manchester derby but Radamel Falcao remains out through injury, United manager Louis van Gaal has confirmed.
Van Gaal denied reports Rooney was suffering from a foot injury and insisted the Manchester United captain is ready to start following a three-match suspension.
But Falcao, who missed the last two games after receiving a kick in training, is still injured.
The Colombian will therefore miss Sunday's hotly-anticipated game against Manchester City at the Etihad Stadium.
Football fans in Manchester might be getting nervous ahead of the derby but one supporter has gone one further by producing a frightening likeness of the club's managers.
Simon McMinnis, a Manchester United supporter from Poulton in Lancashire carved Van Gaal and Pellegrini into giant pumpkins after spotting them in a local supermarket.
The Halloween creations took 25hours in total to make, with Simon using pumpkins weighing in at a whopping 15kg each.
“I’m a blue and he’s a red, so given the time of year we challenged him to come up with something for derby day as a bit of banter and I’m well impressed!
“I’m not sure what Louis and Manuel will make of their pumpkin look-a-likes but we think they are fantastic and I reckon the Pellegrini pumpkin just edges it in terms of best likeness – so I’m hoping that’s an omen for the result of the match too.”
Simon McMinnis added: “I love this time and I’ve carved all sorts of weird and wonderful pumpkins in the past. I’m just hoping that my Van Gaal tribute brings a bit of luck on the pitch for the reds – and they can help Louis carve his way into the Manchester derby history books.”
United and City go head-to-head this Halloween weekend at Eastlands.
Manchester City boss Manuel Pellegrini has dismissed the suggestion that his team, which impresses in the Premier League, is struggling to hit the same heights in Europe. His side drew 2-2 away at CSKA Moscow this week and remain without a win in the Champions League this season.