The Portuguese midfielder has been heavily linked with a switch to the Premier League for much of 2014 after emerging as one of Europe’s finest young enforcers.
United reportedly had an agreement with him ahead of the summer, but David Moyes’ exit scuppered plans to get the 22-year-old to Old Trafford.
Arsenal have since been linked with Carvalho, but Sporting’s demands have caused Arsene Wenger to baulk.
Now it’s understood that Chelsea are leading the pack, despite Jose Mourinho having invested heavily in his squad this transfer window.
It’s believed that a £35m offer is in the pipeline, with ‘The Special One’ keen to further strengthen his engine room for an assault on the Premier League and Champions League.
Carvalho represents Portugal at international level, but was born in Angola – a country he left when he was only a few years old.