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Stewart Downing will sign for Boro tomorrow after agreeing a big money Riverside return.

A fee has been agreed, the ex-England flanker has agreed terms and the formalities have been concluded.

The former Boro fans’ favourite will now take a medical in the morning and sign before jetting out to join Aitor Karanka’s squad in Marbella.

After weeks of haggling Boro chiefs this afternoon concluded the fine-tuning of a complex switch that could be worth up to £7m for Premier League outfit West Ham.

The Gazette understand Boro have agreed a structured payment schedule over the next three years that will guarantee the top flight Hammers £5.5m.

But with performance bonuses and a promotion clause that may eventually reach a whopping £7m.

That is a massive investment for a Championship club but Boro believe Downing - who they intend to play in a No 10 role - can be a game-changer and an influential figure in a promotion push.

Pallister Park raised Downing had two years left on a contract worth a reputed £60,000 a week at West Ham and has taken what club sources described as a massive hit on his personal terms to return.

And with everything now agreed Downing will sign a deal believed to be four years with an option for a further season tomorrow morning.

Then he will fly to meet up with his new team-mates in Spain.

Downing made his debut for Boro in 2001 and played 234 games and notched 22 goals before leaving for Aston Villa for £12m after relegation in July 2009.

Read more on the Downing deal:

Who, what, where, why and how - the lowdown on the deal

Anthony Vickers on a homecoming to galvanise the Riverside

While you've been away: 19 things that have changed at Boro since Stewart Downing left

Downing could be a game changer: Watch Anthony Vickers give his view

Stewart Downing travelling to Teesside to complete £5m Boro switch

I'll be back: What Downing told Gazette on day he left