Celtic have signed Fulham striker Diomansy Kamara and Dutch left back Edson Braafheid from Bayern Munich on loan until the end of the season.
Kamara, 29, has played more than 40 times for Senegal, scoring nine goals, and played under Celtic manager Tony Mowbray when at West Brom.
And 26-year-old Braafheid, who has five caps for the Netherlands, has been signed to bolster the defence.
Mowbray has also completed the signing of Paul Slane, 18, from Motherwell.
Paris-born Kamara has started just five league games for Fulham this season, scoring once, and struck against CSKA Sofia in the Europa League.
His first English club was Portsmouth, who he joined after playing for Red Star 93, Catanzaro and Modena.
A move to West Brom was followed by a switch to Craven Cottage and he made his debut for the club against Arsenal in August 2007.
The following summer he suffered a cruciate ligament injury while playing for Senegal, then made his comeback in February 2009.
But with Andy Johnson, Bobby Zamora, Erik Nevland and David Elm ahead of him in the pecking order at the Premier League club, he has opted to move to Glasgow for regular football with a manager he knows well.
Dutch full-back Braafheid was at Utrecht before moving to FC Twente in 2007, then Bundesliga side Bayern Munich last summer.
He is keen for regular first-team football to help secure his place in the Netherlands squad for the World Cup in South Africa.
The Scottish Premier League side have the option to buy Kamara at the end of the season.
Motherwell, meanwhile, are unhappy at losing their former youth player Slane, at such an early stage in his career. He has signed for Celtic on a four-year deal for an undisclosed fee.
Paul Slane
Motherwell are disappointed to lose Slane to Celtic
A statement by Motherwell chairman John Boyle on the club website said: "We have tried and tried to get Paul to sign a long-term contract but much to our extreme disappointment, he has continually refused.
"We have offered the player improved competitive terms in line with other progressing youngsters at the club but both personally and through his agent, he has refused.
"Paul has been at the club for six years and we have financed his development and nurtured his talent, culminating in his senior debut at the end of last season.
"We have also stuck by and supported him over those years through both personal issues and injury and felt we were due some degree of loyalty for our efforts. Sadly he has chosen to refuse our offers and move on to Celtic."
The arrival of the trio on the final day of the transfer window comes after the signing of FC Seoul's Ki Sung-Yong, Thomas Rogne from Stabaek, Brondby's Morten Rasmussen and Jos Hooiveld from AIK Stockholm.
Kamara, 29, has played more than 40 times for Senegal, scoring nine goals, and played under Celtic manager Tony Mowbray when at West Brom.
And 26-year-old Braafheid, who has five caps for the Netherlands, has been signed to bolster the defence.
Mowbray has also completed the signing of Paul Slane, 18, from Motherwell.
Paris-born Kamara has started just five league games for Fulham this season, scoring once, and struck against CSKA Sofia in the Europa League.
His first English club was Portsmouth, who he joined after playing for Red Star 93, Catanzaro and Modena.
A move to West Brom was followed by a switch to Craven Cottage and he made his debut for the club against Arsenal in August 2007.
The following summer he suffered a cruciate ligament injury while playing for Senegal, then made his comeback in February 2009.
But with Andy Johnson, Bobby Zamora, Erik Nevland and David Elm ahead of him in the pecking order at the Premier League club, he has opted to move to Glasgow for regular football with a manager he knows well.
Dutch full-back Braafheid was at Utrecht before moving to FC Twente in 2007, then Bundesliga side Bayern Munich last summer.
He is keen for regular first-team football to help secure his place in the Netherlands squad for the World Cup in South Africa.
The Scottish Premier League side have the option to buy Kamara at the end of the season.
Motherwell, meanwhile, are unhappy at losing their former youth player Slane, at such an early stage in his career. He has signed for Celtic on a four-year deal for an undisclosed fee.
Paul Slane
Motherwell are disappointed to lose Slane to Celtic
A statement by Motherwell chairman John Boyle on the club website said: "We have tried and tried to get Paul to sign a long-term contract but much to our extreme disappointment, he has continually refused.
"We have offered the player improved competitive terms in line with other progressing youngsters at the club but both personally and through his agent, he has refused.
"Paul has been at the club for six years and we have financed his development and nurtured his talent, culminating in his senior debut at the end of last season.
"We have also stuck by and supported him over those years through both personal issues and injury and felt we were due some degree of loyalty for our efforts. Sadly he has chosen to refuse our offers and move on to Celtic."
The arrival of the trio on the final day of the transfer window comes after the signing of FC Seoul's Ki Sung-Yong, Thomas Rogne from Stabaek, Brondby's Morten Rasmussen and Jos Hooiveld from AIK Stockholm.
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