11 players who have played for both Chelsea and Manchester United
Paul Parker played primarily as a center back for Fulham and Queens Park Rangers before making the move to Manchester United in 1991, when he was shifted to the right-back role by Sir Alex Ferguson.
The former England international had a very successful stint in Manchester in terms of silverware, winning five trophies during his five-year spell, including two Premier League titles. Parker had established himself as a regular in the starting XI under Ferguson and was thriving his new position.
But injuries plagued him during his latter years as he was displaced by the up and coming Gary Neville, losing his spot at the club and also at the international level. The last two years at Old Trafford were very rough for the Englishman as he warmed the benches and barely had a look in during his final season.
Following his exit from United, Paul Parker played for six clubs in the span of two seasons, which included stints throughout the top four divisions of English football and later at the Non-League level.
He joined Chelsea after a very brief stint in Fulham midway during the second half of the season and played only four games during his short-lived stay in West London.
Mal Donaghy joined Manchester United in 1988 after a successful 10-year spell at Luton Town. The Northern Irishman was a versatile defender, excelling both at center back and also as a fullback.
During his time at United, Donaghy made 89 appearances for the Red Devils but found opportunities scarce following an impressive debut season and was loaned out to former club Luton.
However, he did enjoy a triumphant career in Manchester, winning three trophies during his four-year spell before being signed up by Chelsea in 1992.
Chelsea was Mal Donaghy's final destination, notching up 68 appearances for the club and scoring three goals during his two-year stint as he announced his retirement from professional football at the end of the season.
Nemanja Matic was initially signed by Chelsea in 2009 and was subsequently loaned out to Vitesse Arnhem in his second season.
But, after being able to make only three appearances for the club in his two-year stay, he was deemed surplus to requirements and was sold in an exchange deal with Benfica that saw David Luiz come over to London.
Following a successful three year spell in Portugal, Matic returned to England after being signed up by Chelsea in the 2014 January transfer window.
The Serbian immediately became a regular in the starting XI for the Blues and went on to establish himself as one of the best defensive midfielders in European football for the coming years.
His second season in London brought him more success, as Chelsea completed the domestic double of the Premier League and League Cup in 2015. Matic also had the capability of chipping in with timely goals, including a long-range stunner against Tottenham Hotspur in the semi-final of the 2016/17 FA Cup.
Following another successful campaign at Stamford Bridge, the 29-year-old was surprisingly sold to rivals Manchester United in July 2017 for a fee of around £40 million, bringing an end to a three and a half year stay that brought seven goals, 19 assists, two Premier League titles. He was later replaced by new signing Tiemoue Bakayoko in London.
But Matic quickly adjusted to new surroundings in Manchester, making 48 appearances in all competitions as he has become a prominent fixture in midfield and one of the first names on the teamsheet for Mourinho.
This campaign, defensively, he has accumulated two tackles, 1.8 interceptions along with five long balls per game thus far.
Ultimately, letting Nemanja Matic go has proven to be Chelsea's loss and Manchester United's gain as Bakayoko has failed to live up to expectations whereas the Red Devils have prospered from the presence of the Serbian on the pitch.