What time do Manchester United need to register Alexis Sanchez by to play against Burnley this weekend?

ALEXIS SANCHEZ must be registered as a Manchester United player by midday on Friday if is to face Burnley on Saturday.

The same applies to Henrikh Mkhitaryan should he wish to make his Arsenal debut against Crystal Palace, says

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The two players are in the throes of swapping clubs.

Mkhitaryan's agent Mino Riaola was trying to tie things up with Arsenal on Thursday night so both of them can play for their new teams this weekend.

Sanchez is reported to have been training with the Gunners' youth squad while his move to Old Trafford was thrashed out.

He looks to have agreed a £490,000 a week deal with United and will sign on for four-and-a half-years.

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The Chilean could have left for free in the summer when his Arsenal contract runs out.

At least this way the Gunners get Mkhitaryan, whose first-team chances under Jose Mourinho have fluctuated wildly.

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Arsenal manager Arsene Wenger will be sad to lose Sanchez.

But he says the fact that Mkhitaryan will join as part of the deal softens the blow.

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And he doesn't feel as bad as when Robin van Persie left for United in 2012.

"We took Van Persie when he played in the reserve team at Feyenoord,” Wenger said. "And we made a long work with him.

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"When you get them there to the level and, after, they leave – of course that is the most painful and, after that, they do well for the other club.

"I would say our fans know Alexis will not extend his contract and they have accepted that idea.

"And the fact it will not be one-way traffic, it will be other way traffic as well [with Mkhitaryan] – that makes the whole thing a bit smoother, maybe, a bit less disappointing.”