It was reported last month that the Gunners had launched a £50million bid to try and bring the striker to the Premier League.
And claims on deadline day suggested Chelsea were also in the running.
Transfer Market Web also reported that Liverpool had entered the race to land Belotti.
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Andrea Belotti has been linked with a move to Manchester United
Jose Mourinho has sent scouts to watch Andrea Belotti in action
But the same site claim Manchester United have now joined the hunt.
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Scouts from Old Trafford have apparently been sent by Jose Mourinho to watch the striker in action.
The striker could join as an alternative to Antoine Griezmann.
However, any deal is not likely to come cheap.
Andrea Belotti is wanted by a host of European giants
Belotti signed a new contract earlier in this season which raises his buyout clause to £84million.
The Premier League quartet also face competition from Real Madrid to sign the Italy international.
Italian newspaper Gazzetta dello Sport last week said talks between the Spanish club and Torino are due to take place this week.