Swansea have had a bid accepted for Hull midfielder Sam Clucas and expect the transfer to be completed within the next 48 hours.
Press Association Sport understands the deal is worth £15million with another potential £1.5m in add-ons.
Swansea targeted Clucas following the club-record sale of Gylfi Sigurdsson to Everton last week for a fee around the £45million mark.
Clucas is expected to agree personal terms and have a medical in south Wales on Wednesday following Swansea's Carabao Cup tie at MK Dons the previous evening.
Lincoln-born Clucas joined Hull from Chesterfield for £1.3m in July 2015 and scored nine goals in 96 appearances.
The 26-year-old was one of Hull's best performers last season when the Tigers were relegated from the Premier League.
Clucas started Hull's first three Sky Bet Championship matches this season, but he did not feature in Saturday's 2-1 defeat at QPR following talk of Swansea interest.
It is understood that Swansea had an earlier £12m bid for Clucas rejected by Hull.
Swansea's need for attacking reinforcements was underlined by head coach Paul Clement following their 4-0 defeat to Manchester United on Saturday.
With Sigurdsson sold and last season's top scorer Fernando Llorente out injured, Swansea have managed only one on-target goal attempt in their opening two Premier League games.
"The need (to strengthen) has been reinforced by the performances and the results," Clement said with Swansea having taken only one point from the two games.
"The moment Gylfi's going you know you need to strengthen.
"Without him, Llorente and Ki (Sung-yueng) we are weaker.
"We still have a good squad, but we absolutely need more quality players to come in so we have a chance of being competitive this year."
Clement said he had targeted "two or three players" to fill the void left by Sigurdsson's departure.
As well as Clucas, former Swansea players Wilfried Bony and Joe Allen have both been high on the club's list of targets.
Bony is surplus to requirements at Manchester City and Swansea are hopeful of concluding a deal, although Stoke have rejected an inquiry for Allen and said the Wales midfielder is not for sale.