Chris Smalling’s long-touted permanent move from Man United to Roma stands on the verge of collapse, Football Insider can reveal.

The defender, 30, has been training away from the United squad while negotiations have continued over his transfer to the Serie A club.

A recruitment source has told Football Insider that Roma are losing patience with United over the negotiations that have failed to result in an agreement.

The Italian club are now ready to move onto other targets ahead of the imminent Serie A campaign as they want a senior centre-back to be signed quickly.

United have been holding out for around £20million for Smalling, who has two years remaining on his Old Trafford contract.

He spent last season on loan at Roma and made a big impression while starting the majority of their matches.

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Tellingly, he missed United’s photoshoots for TV yesterday as he remains intent on leaving.

Smalling was absent from training on Tuesday and Wednesday last week after making up his mind to leave Old Trafford.

He returned on Thursday to train on his own and do gym work but the transfer has yet to materialise as he hoped.

Smalling has made 323 appearances for United since his £10million transfer from Fulham when Sir Alex Ferguson was still in charge.

United’s own transfer plans could depend upon selling Smalling as their manager Ole-Gunnar is in the market for a new centre back.

The Red Devils also want cover at left-back and another attacking player.

In other Man United news, it can be REVEALED how the club reached agreement over blockbuster deal worth more than £100,000-a-week.